feat: 付费体系重构 P0 - 配额独立化/简历付费下载/PDF生成

backend/package-lock.json

@@ -33,6 +33,7 @@
         "passport": "^0.7.0",
         "passport-jwt": "^4.0.1",
         "pdf-parse": "^2.4.5",
+        "puppeteer": "^25.1.0",
         "reflect-metadata": "^0.2.1",
         "rxjs": "^7.8.1",
         "tesseract.js": "^7.0.0",
@@ -2264,6 +2265,30 @@
         "node": ">=18"
       }
     },
+    "node_modules/@puppeteer/browsers": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmmirror.com/@puppeteer/browsers/-/browsers-3.0.4.tgz",
+      "integrity": "sha512-HGM8iAmGTf+Y7t0373szVbTmt3d7vPkYL/1bpOkOFO0YUYLgSeuYBCzESklogNPvOBnZ/MRD5f07OkpqH1trtA==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "modern-tar": "^0.7.6",
+        "yargs": "^17.7.2"
+      },
+      "bin": {
+        "browsers": "lib/main-cli.js"
+      },
+      "engines": {
+        "node": ">=22.12.0"
+      },
+      "peerDependencies": {
+        "proxy-agent": ">=8.0.1"
+      },
+      "peerDependenciesMeta": {
+        "proxy-agent": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/@sinclair/typebox": {
       "version": "0.34.49",
       "resolved": "https://registry.npmjs.org/@sinclair/typebox/-/typebox-0.34.49.tgz",
@@ -3211,7 +3236,6 @@
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-      "devOptional": true,
       "license": "MIT",
       "engines": {
         "node": ">=8"
@@ -3914,6 +3938,22 @@
         "node": ">=6.0"
       }
     },
+    "node_modules/chromium-bidi": {
+      "version": "16.0.1",
+      "resolved": "https://registry.npmmirror.com/chromium-bidi/-/chromium-bidi-16.0.1.tgz",
+      "integrity": "sha512-J63PGu/9PpeCwLIcKYyzWP6yaVL5pxuBc0shlYCYM8BaAkmlwiQboXO1iNbOgSDbVklEyYFfNEcHD8oOAWacUA==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "mitt": "^3.0.1",
+        "zod": "^3.24.1"
+      },
+      "engines": {
+        "node": ">=20.19.0 <22.0.0 || >=22.12.0"
+      },
+      "peerDependencies": {
+        "devtools-protocol": "*"
+      }
+    },
     "node_modules/ci-info": {
       "version": "4.4.0",
       "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-4.4.0.tgz",
@@ -4023,7 +4063,6 @@
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-      "dev": true,
       "license": "ISC",
       "dependencies": {
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@@ -4038,7 +4077,6 @@
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-      "dev": true,
       "license": "MIT",
       "dependencies": {
         "ansi-styles": "^4.0.0",
@@ -4422,6 +4460,12 @@
         "node": ">=8"
       }
     },
+    "node_modules/devtools-protocol": {
+      "version": "0.0.1624250",
+      "resolved": "https://registry.npmmirror.com/devtools-protocol/-/devtools-protocol-0.0.1624250.tgz",
+      "integrity": "sha512-YFAat/lOiIk0ARmBweG+ygrEcbZrq5B9urRyUoeQKp53MlidHXE2TmTbxKcaXoQj7u/aX+jebDO4BW55rs0WwA==",
+      "license": "BSD-3-Clause"
+    },
     "node_modules/dezalgo": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/dezalgo/-/dezalgo-1.0.4.tgz",
@@ -4519,7 +4563,6 @@
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-      "devOptional": true,
       "license": "MIT"
     },
     "node_modules/encodeurl": {
@@ -4611,7 +4654,6 @@
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.2.0.tgz",
       "integrity": "sha512-WUj2qlxaQtO4g6Pq5c29GTcWGDyd8itL8zTlipgECz3JesAiiOKotd8JU6otB3PACgG6xkJUyVhboMS+bje/jA==",
-      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=6"
@@ -5136,7 +5178,6 @@
       "version": "2.0.5",
       "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-2.0.5.tgz",
       "integrity": "sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg==",
-      "dev": true,
       "license": "ISC",
       "engines": {
         "node": "6.* || 8.* || >= 10.*"
@@ -5707,7 +5748,6 @@
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-3.0.0.tgz",
       "integrity": "sha512-zymm5+u+sCsSWyD9qNaejV3DFvhCKclKdizYaJUuHA83RLjb7nSuGnddCHGv0hk+KY7BMAlsWeK4Ueg6EV6XQg==",
-      "devOptional": true,
       "license": "MIT",
       "engines": {
         "node": ">=8"
@@ -6946,6 +6986,18 @@
         "immediate": "~3.0.5"
       }
     },
+    "node_modules/lilconfig": {
+      "version": "3.1.3",
+      "resolved": "https://registry.npmmirror.com/lilconfig/-/lilconfig-3.1.3.tgz",
+      "integrity": "sha512-/vlFKAoH5Cgt3Ie+JLhRbwOsCQePABiU3tJ1egGvyQ+33R/vcwM2Zl2QR/LzjsBeItPt3oSVXapn+m4nQDvpzw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=14"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/antonk52"
+      }
+    },
     "node_modules/lines-and-columns": {
       "version": "1.2.4",
       "resolved": "https://registry.npmjs.org/lines-and-columns/-/lines-and-columns-1.2.4.tgz",
@@ -7296,6 +7348,12 @@
         "node": ">=16 || 14 >=14.17"
       }
     },
+    "node_modules/mitt": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmmirror.com/mitt/-/mitt-3.0.1.tgz",
+      "integrity": "sha512-vKivATfr97l2/QBCYAkXYDbrIWPM2IIKEl7YPhjCvKlG3kE2gm+uBo6nEXK3M5/Ffh/FLpKExzOQ3JJoJGFKBw==",
+      "license": "MIT"
+    },
     "node_modules/mkdirp": {
       "version": "0.5.6",
       "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.6.tgz",
@@ -7308,6 +7366,15 @@
         "mkdirp": "bin/cmd.js"
       }
     },
+    "node_modules/modern-tar": {
+      "version": "0.7.6",
+      "resolved": "https://registry.npmmirror.com/modern-tar/-/modern-tar-0.7.6.tgz",
+      "integrity": "sha512-sweCIVXzx1aIGTCdzcMlSZt1h8k5Tmk08VNAuRk3IU28XamGiOH5ypi11g6De2CH7PhYqSSnGy2A/EFhbWnVKg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18.0.0"
+      }
+    },
     "node_modules/mongodb": {
       "version": "6.20.0",
       "resolved": "https://registry.npmjs.org/mongodb/-/mongodb-6.20.0.tgz",
@@ -8149,6 +8216,44 @@
         "node": ">=6"
       }
     },
+    "node_modules/puppeteer": {
+      "version": "25.1.0",
+      "resolved": "https://registry.npmmirror.com/puppeteer/-/puppeteer-25.1.0.tgz",
+      "integrity": "sha512-7L6/0JM7XStK99lIL4xQySyNEXNfII6pk0BxkI5kKBTOhR7AsoQiv067YTsE/rIXxQiq9ajlO4WcqBjS/FWK1A==",
+      "hasInstallScript": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@puppeteer/browsers": "3.0.4",
+        "chromium-bidi": "16.0.1",
+        "devtools-protocol": "0.0.1624250",
+        "lilconfig": "^3.1.3",
+        "puppeteer-core": "25.1.0",
+        "typed-query-selector": "^2.12.2"
+      },
+      "bin": {
+        "puppeteer": "lib/puppeteer/node/cli.js"
+      },
+      "engines": {
+        "node": ">=22.12.0"
+      }
+    },
+    "node_modules/puppeteer-core": {
+      "version": "25.1.0",
+      "resolved": "https://registry.npmmirror.com/puppeteer-core/-/puppeteer-core-25.1.0.tgz",
+      "integrity": "sha512-jKzy5y4WG6uNuFbTWgW1D7mqoT9o0nllc/6a1DGF775T1mPmgw3scdFEtEq67yVFikavQmbYq6NLfbTfxHSlqQ==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@puppeteer/browsers": "3.0.4",
+        "chromium-bidi": "16.0.1",
+        "devtools-protocol": "0.0.1624250",
+        "typed-query-selector": "^2.12.2",
+        "webdriver-bidi-protocol": "0.4.2",
+        "ws": "^8.21.0"
+      },
+      "engines": {
+        "node": ">=22.12.0"
+      }
+    },
     "node_modules/pure-rand": {
       "version": "7.0.1",
       "resolved": "https://registry.npmjs.org/pure-rand/-/pure-rand-7.0.1.tgz",
@@ -8308,7 +8413,6 @@
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/require-directory/-/require-directory-2.1.1.tgz",
       "integrity": "sha512-fGxEI7+wsG9xrvdjsrlmL22OMTTiHRwAMroiEeMgq8gzoLC/PQr7RsRDSTLUg/bZAZtF+TVIkHc6/4RIKrui+Q==",
-      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=0.10.0"
@@ -8806,7 +8910,6 @@
       "version": "4.2.3",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
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-      "devOptional": true,
       "license": "MIT",
       "dependencies": {
         "emoji-regex": "^8.0.0",
@@ -8837,7 +8940,6 @@
       "version": "6.0.1",
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
       "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
-      "devOptional": true,
       "license": "MIT",
       "dependencies": {
         "ansi-regex": "^5.0.1"
@@ -9522,6 +9624,12 @@
         "node": ">= 0.6"
       }
     },
+    "node_modules/typed-query-selector": {
+      "version": "2.12.2",
+      "resolved": "https://registry.npmmirror.com/typed-query-selector/-/typed-query-selector-2.12.2.tgz",
+      "integrity": "sha512-EOPFbyIub4ngnEdqi2yOcNeDLaX/0jcE1JoAXQDDMIthap7FoN795lc/SHfIq2d416VufXpM8z/lD+WRm2gfOQ==",
+      "license": "MIT"
+    },
     "node_modules/typedarray": {
       "version": "0.0.6",
       "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
@@ -9775,6 +9883,12 @@
         "defaults": "^1.0.3"
       }
     },
+    "node_modules/webdriver-bidi-protocol": {
+      "version": "0.4.2",
+      "resolved": "https://registry.npmmirror.com/webdriver-bidi-protocol/-/webdriver-bidi-protocol-0.4.2.tgz",
+      "integrity": "sha512-VSV+fzfChirL3e7jay2yUC7B4HQCGtEWEg/MSSQbK+qWbqeGlRLlXTzPpYr3XGUvbpDHumWZBJxgesg4N7dbtA==",
+      "license": "Apache-2.0"
+    },
     "node_modules/webidl-conversions": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-7.0.0.tgz",
@@ -9964,6 +10078,27 @@
         "node": "^14.17.0 || ^16.13.0 || >=18.0.0"
       }
     },
+    "node_modules/ws": {
+      "version": "8.21.0",
+      "resolved": "https://registry.npmmirror.com/ws/-/ws-8.21.0.tgz",
+      "integrity": "sha512-Vsp28b7DRcimFQvrqu2Wek3z1iYxDCWqHYB8Qsnk/S4RfaCQzPGPyBNuVjJV3cd6UiKtUtp6sNM77gWvzcCH+g==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": ">=5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/xmlbuilder": {
       "version": "10.1.1",
       "resolved": "https://registry.npmjs.org/xmlbuilder/-/xmlbuilder-10.1.1.tgz",
@@ -9986,7 +10121,6 @@
       "version": "5.0.8",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
       "integrity": "sha512-0pfFzegeDWJHJIAmTLRP2DwHjdF5s7jo9tuztdQxAhINCdvS+3nGINqPd00AphqJR/0LhANUS6/+7SCb98YOfA==",
-      "dev": true,
       "license": "ISC",
       "engines": {
         "node": ">=10"
@@ -10003,7 +10137,6 @@
       "version": "17.7.2",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.7.2.tgz",
       "integrity": "sha512-7dSzzRQ++CKnNI/krKnYRV7JKKPUXMEh61soaHKg9mrWEhzFWhFnxPxGl+69cD1Ou63C13NUPCnmIcrvqCuM6w==",
-      "dev": true,
       "license": "MIT",
       "dependencies": {
         "cliui": "^8.0.1",
@@ -10022,7 +10155,6 @@
       "version": "21.1.1",
       "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-21.1.1.tgz",
       "integrity": "sha512-tVpsJW7DdjecAiFpbIB1e3qxIQsE6NoPc5/eTdrbbIC4h0LVsWhnoa3g+m2HclBIujHzsxZ4VJVA+GUuc2/LBw==",
-      "dev": true,
       "license": "ISC",
       "engines": {
         "node": ">=12"
@@ -10049,6 +10181,15 @@
       "engines": {
         "node": "*"
       }
+    },
+    "node_modules/zod": {
+      "version": "3.25.76",
+      "resolved": "https://registry.npmmirror.com/zod/-/zod-3.25.76.tgz",
+      "integrity": "sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==",
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/colinhacks"
+      }
     }
   }
 }

backend/package.json

@@ -61,6 +61,7 @@
     "passport": "^0.7.0",
     "passport-jwt": "^4.0.1",
     "pdf-parse": "^2.4.5",
+    "puppeteer": "^25.1.0",
     "reflect-metadata": "^0.2.1",
     "rxjs": "^7.8.1",
     "tesseract.js": "^7.0.0",

backend/src/modules/admin/admin.controller.ts

@@ -8,6 +8,7 @@ import { User, UserDocument } from '../user/user.schema'
 import { Interview, InterviewDocument } from '../interview/interview.schema'
 import { PaymentOrder, PaymentOrderDocument } from '../payment/payment-order.schema'
 import { SiteConfig, SiteConfigDocument } from '../schemas/site-config.schema'
+import { QuotaService } from '../user/quota.service'
 import { WechatPayService } from '../payment/wechat-pay.service'
 
 const VIP_DURATION_DAYS = 30
@@ -20,6 +21,7 @@ export class AdminController {
     @InjectModel(Interview.name) private interviewModel: Model<InterviewDocument>,
     @InjectModel(PaymentOrder.name) private orderModel: Model<PaymentOrderDocument>,
     @InjectModel(SiteConfig.name) private configModel: Model<SiteConfigDocument>,
+    private quotaService: QuotaService,
     private wechatPay: WechatPayService,
   ) {}
 
@@ -82,8 +84,7 @@ export class AdminController {
     expireAt.setDate(expireAt.getDate() + VIP_DURATION_DAYS)
     user.plan = 'growth'
     user.vipExpireAt = expireAt
-    user.remaining = 999
+    await this.quotaService.setPlanQuota(targetUserId, 'growth', { interview: 999, resumeOptimize: 20, resumeDownload: 10 })
-    await user.save()
     return { success: true, plan: 'growth', expireAt }
   }
 
@@ -126,14 +127,20 @@ export class AdminController {
       order.wxTransactionId = wxResult?.transaction_id || ''
       order.paidAt = new Date()
       await order.save()
-      const user = await this.userModel.findById(order.userId).exec()
+      if (order.type === 'membership') {
-      if (user && user.plan === 'free') {
+        const user = await this.userModel.findById(order.userId).exec()
-        const expireAt = new Date()
+        if (user && user.plan === 'free') {
-        expireAt.setDate(expireAt.getDate() + VIP_DURATION_DAYS)
+          const expireAt = new Date()
-        user.plan = 'growth'
+          expireAt.setDate(expireAt.getDate() + VIP_DURATION_DAYS)
-        user.vipExpireAt = expireAt
+          user.plan = 'growth'
-        user.remaining = 999
+          user.vipExpireAt = expireAt
-        await user.save()
+          await this.quotaService.setPlanQuota(order.userId, 'growth', { interview: 999, resumeOptimize: 20, resumeDownload: 10 })
+        }
+      } else {
+        const credits = { interview: 1, optimize: 1, download: 1 }[order.type]
+        if (credits) {
+          await this.quotaService.grantCredits(order.userId, order.type as any, credits)
+        }
       }
     }
     return { order, wxResult }
@@ -179,8 +186,8 @@ const DEFAULT_CONFIG = {
   optimize: { dailyFreeLimit: 2 },
   price: { monthly: 1990 },
   plans: {
-    free: { name: '免费版', price: 0, features: ['每日 3 次 AI 模拟面试', '每场最多 5 轮 AI 对话', '基础面试报告', '简历诊断', '简历优化'] },
+    free: { name: '免费版', price: 0, features: ['AI 模拟面试 1 次（体验）', '每场最多 5 轮 AI 对话', '基础面试报告', '简历优化（限 3 次）'] },
-    growth: { name: '成长版', price: 1990, features: ['免费版全部权益', '无限面试次数', '每场最多 10 轮 AI 对话', '详细面试报告（四维评分）', '进步轨迹雷达图 + 打卡', '参考回答思路', '公司真题库'] },
+    growth: { name: '成长版', price: 1990, features: ['免费版全部权益', 'AI 数字人面试无限次', '每场最多 10 轮 AI 对话', '详细面试报告（四维评分）', '进步轨迹雷达图 + 打卡', '参考回答思路', '公司真题库', '简历优化 20 次/月', '简历下载 10 次/月'] },
   },
 }
 

backend/src/modules/admin/admin.module.ts

@@ -2,6 +2,7 @@ import { Module } from '@nestjs/common'
 import { MongooseModule } from '@nestjs/mongoose'
 import { AdminController } from './admin.controller'
 import { User, UserSchema } from '../user/user.schema'
+import { UserModule } from '../user/user.module'
 import { Interview, InterviewSchema } from '../interview/interview.schema'
 import { PaymentOrder, PaymentOrderSchema } from '../payment/payment-order.schema'
 import { WechatPayService } from '../payment/wechat-pay.service'
@@ -16,6 +17,7 @@ import { SiteConfig, SiteConfigSchema } from '../schemas/site-config.schema'
       { name: PaymentOrder.name, schema: PaymentOrderSchema },
       { name: SiteConfig.name, schema: SiteConfigSchema },
     ]),
+    UserModule,
   ],
   controllers: [AdminController],
   providers: [WechatPayService, AdminGuard],

backend/src/modules/analyze/analyze.controller.ts

@@ -5,6 +5,8 @@ import { AnalyzeService } from './analyze.service'
 import { JwtAuthGuard } from '../../common/guards/jwt-auth.guard'
 import { CurrentUser } from '../../common/decorators/current-user.decorator'
 import { UserService } from '../user/user.service'
+import { QuotaService } from '../user/quota.service'
+import { ResumeService } from '../resume/resume.service'
 import { BenchmarkService, PositionBenchmark } from '../progress/benchmark.service'
 import { Progress, ProgressDocument } from '../schemas/progress.schema'
 
@@ -13,6 +15,8 @@ export class AnalyzeController {
   constructor(
     private analyzeService: AnalyzeService,
     private userService: UserService,
+    private quotaService: QuotaService,
+    private resumeService: ResumeService,
     private benchmarkService: BenchmarkService,
     @InjectModel(Progress.name) private progressModel: Model<ProgressDocument>,
   ) {}
@@ -26,9 +30,21 @@ export class AnalyzeController {
 
   @UseGuards(JwtAuthGuard)
   @Post('optimize')
-  async optimize(@Body('content') content: string, @Body('direction') direction: string, @CurrentUser('userId') userId: string) {
+  async optimize(
+    @Body('content') content: string,
+    @Body('direction') direction: string,
+    @Body('resumeId') resumeId: string,
+    @CurrentUser('userId') userId: string,
+  ) {
     await this.checkAnalyzeLimit(userId)
-    return this.analyzeService.optimize(content, direction)
+    const result = await this.analyzeService.optimize(content, direction)
+
+    if (resumeId && result.optimized && result.optimized !== content) {
+      const updated = await this.resumeService.updateAfterOptimize(resumeId, userId, result.optimized, direction)
+      return { ...result, newVersion: updated }
+    }
+
+    return result
   }
 
   /** 技能缺口分析：将用户四维分数与目标岗位基准对比 */
@@ -106,13 +122,6 @@ export class AnalyzeController {
   }
 
   private async checkAnalyzeLimit(userId: string) {
-    const user = await this.userService.getModel().findById(userId).exec()
+    await this.quotaService.checkAndDeductOptimize(userId)
-    if (!user) throw new HttpException('用户不存在', HttpStatus.NOT_FOUND)
-    if (user.plan !== 'free') return
-    if (user.remaining <= 0) {
-      throw new HttpException('免费版每日次数已用完，升级会员后不限次使用', HttpStatus.FORBIDDEN)
-    }
-    user.remaining -= 1
-    await user.save()
   }
 }

backend/src/modules/analyze/analyze.module.ts

@@ -3,12 +3,14 @@ import { MongooseModule } from '@nestjs/mongoose'
 import { AnalyzeController } from './analyze.controller'
 import { AnalyzeService } from './analyze.service'
 import { UserModule } from '../user/user.module'
+import { ResumeModule } from '../resume/resume.module'
 import { ProgressModule } from '../progress/progress.module'
 import { Progress, ProgressSchema } from '../schemas/progress.schema'
 
 @Module({
   imports: [
     UserModule,
+    ResumeModule,
     ProgressModule,
     MongooseModule.forFeature([{ name: Progress.name, schema: ProgressSchema }]),
   ],

backend/src/modules/interview/interview.service.ts

@@ -5,6 +5,7 @@ import { Interview, InterviewDocument } from './interview.schema'
 import { Progress, ProgressDocument } from '../schemas/progress.schema'
 import { AiService } from '../ai/ai.service'
 import { UserService } from '../user/user.service'
+import { QuotaService } from '../user/quota.service'
 import { analyzeSpeech } from '../../common/utils/filler-words'
 
 @Injectable()
@@ -14,11 +15,11 @@ export class InterviewService {
     @InjectModel(Progress.name) private progressModel: Model<ProgressDocument>,
     private aiService: AiService,
     private userService: UserService,
+    private quotaService: QuotaService,
   ) {}
 
   async create(userId: string, position: string) {
-    // 扣减使用次数
+    await this.quotaService.checkAndDeductInterview(userId)
-    await this.userService.deductRemaining(userId)
 
     const firstQuestion = await this.aiService.call({
       systemPrompt: `你是一位专业的${position}面试官。请针对校招该岗位提出第一个面试问题，要求具体且有针对性。直接输出问题，不要多余内容。`,

backend/src/modules/member/member.controller.ts

@@ -5,6 +5,7 @@ import { User, UserDocument } from '../user/user.schema'
 import { PaymentOrder, PaymentOrderDocument } from '../payment/payment-order.schema'
 import { JwtAuthGuard } from '../../common/guards/jwt-auth.guard'
 import { CurrentUser } from '../../common/decorators/current-user.decorator'
+import { QuotaService } from '../user/quota.service'
 import { Public } from '../../common/decorators/public.decorator'
 
 const GROWTH_PRICE = 1990
@@ -24,14 +25,15 @@ const PLANS: Record<string, PlanConfig> = {
   free: {
     id: 'free', name: '免费版', price: 0, dailyLimit: FREE_DAILY_LIMIT,
     features: [
-      '每日 2 次 AI 模拟面试', '基础面试报告', '通用题库随机出题', '简历诊断（限 3 次）',
+      'AI 模拟面试 1 次（体验）', '基础面试报告', '通用题库随机出题', '简历优化（限 3 次免费）',
     ],
   },
   growth: {
     id: 'growth', name: '成长版', price: GROWTH_PRICE, dailyLimit: 999,
     features: [
-      '免费版全部权益', '无限面试次数', '详细面试报告（四维评分）',
+      '免费版全部权益', 'AI 数字人面试无限次', '详细面试报告（四维评分）',
       '进步轨迹雷达图 + 打卡', '每日一题推送', '参考回答思路', '公司真题库',
+      '简历优化 20 次/月', '简历下载 10 次/月',
     ],
   },
   sprint: {
@@ -39,6 +41,7 @@ const PLANS: Record<string, PlanConfig> = {
     features: [
       '成长版全部权益', 'AI 语音分析（语气词/语速检测）', '技能缺口分析报告',
       '学习路径推荐', '真人导师 1v1 点评（每月 1 次）', '简历精修（每月 1 次）', '内推优先',
+      '简历优化 50 次/月', '简历下载 30 次/月',
     ],
   },
 }
@@ -51,6 +54,7 @@ export class MemberController {
   constructor(
     @InjectModel(User.name) private userModel: Model<UserDocument>,
     @InjectModel(PaymentOrder.name) private orderModel: Model<PaymentOrderDocument>,
+    private quotaService: QuotaService,
   ) {}
 
   @Public()
@@ -82,6 +86,10 @@ export class MemberController {
       vipExpireAt: user.vipExpireAt,
       sprintExpireAt: user.sprintExpireAt,
       sprintRemaining: user.sprintRemaining || 0,
+      interviewCredits: user.interviewCredits ?? 1,
+      resumeOptimizeCredits: user.resumeOptimizeCredits ?? 0,
+      resumeDownloadCredits: user.resumeDownloadCredits ?? 0,
+      freeOptimizeUsed: user.freeOptimizeUsed ?? 0,
       isVip: user.plan !== 'free',
     }
   }
@@ -99,16 +107,19 @@ export class MemberController {
 
     const expireAt = new Date()
     expireAt.setDate(expireAt.getDate() + DURATION_DAYS)
+    const credits = { interview: 999, resumeOptimize: 20, resumeDownload: 10 }
     if (order.plan === 'sprint') {
       user.plan = 'sprint'
       user.sprintExpireAt = expireAt
       user.sprintRemaining = 10
+      credits.interview = 999
+      credits.resumeOptimize = 50
+      credits.resumeDownload = 30
     } else {
       user.plan = 'growth'
       user.vipExpireAt = expireAt
     }
-    user.remaining = 999
+    await this.quotaService.setPlanQuota(userId, order.plan, credits)
-    await user.save()
     return { success: true, plan: user.plan, planName: PLANS[user.plan]?.name, expireAt }
   }
 

backend/src/modules/member/member.module.ts

@@ -2,13 +2,17 @@ import { Module } from '@nestjs/common'
 import { MongooseModule } from '@nestjs/mongoose'
 import { MemberController } from './member.controller'
 import { User, UserSchema } from '../user/user.schema'
+import { UserModule } from '../user/user.module'
 import { PaymentOrder, PaymentOrderSchema } from '../payment/payment-order.schema'
 
 @Module({
-  imports: [MongooseModule.forFeature([
+  imports: [
-    { name: User.name, schema: UserSchema },
+    MongooseModule.forFeature([
-    { name: PaymentOrder.name, schema: PaymentOrderSchema },
+      { name: User.name, schema: UserSchema },
-  ])],
+      { name: PaymentOrder.name, schema: PaymentOrderSchema },
+    ]),
+    UserModule,
+  ],
   controllers: [MemberController],
 })
 export class MemberModule {}

backend/src/modules/payment/payment-order.schema.ts

@@ -27,12 +27,18 @@ export class PaymentOrder {
   @Prop({ default: 'pending' })
   status: string
 
+  @Prop({ default: 'membership' })
+  type: string            // membership | interview | optimize | download
+
   @Prop({ default: 'growth' })
   plan: string            // growth | sprint
 
   @Prop({ default: 'native' })
   channel: string         // native | jsapi
 
+  @Prop({ type: Object })
+  metadata?: Record<string, any>
+
   @Prop()
   paidAt?: Date
 

backend/src/modules/payment/payment.controller.spec.ts

@@ -2,12 +2,14 @@ import { Test, TestingModule } from '@nestjs/testing'
 import { getModelToken } from '@nestjs/mongoose'
 import { PaymentController } from './payment.controller'
 import { WechatPayService } from './wechat-pay.service'
+import { QuotaService } from '../user/quota.service'
 
 describe('PaymentController', () => {
   let controller: PaymentController
   let mockUserModel: any
   let mockOrderModel: any
   let mockWechatPay: any
+  let mockQuotaService: any
 
   const mockUserId = '507f1f77bcf86cd799439011'
 
@@ -26,6 +28,10 @@ describe('PaymentController', () => {
       jsapiPay: jest.fn().mockResolvedValue({ paySign: 'mock-sign', nonceStr: 'mock-nonce', package: 'prepay_id=mock', timeStamp: '123456', signType: 'RSA' }),
       queryOrder: jest.fn().mockResolvedValue({ trade_state: 'SUCCESS', transaction_id: 'wx123' }),
     }
+    mockQuotaService = {
+      grantCredits: jest.fn().mockResolvedValue(undefined),
+      setPlanQuota: jest.fn().mockResolvedValue(undefined),
+    }
 
     const module: TestingModule = await Test.createTestingModule({
       controllers: [PaymentController],
@@ -33,6 +39,7 @@ describe('PaymentController', () => {
         { provide: getModelToken('User'), useValue: mockUserModel },
         { provide: getModelToken('PaymentOrder'), useValue: mockOrderModel },
         { provide: WechatPayService, useValue: mockWechatPay },
+        { provide: QuotaService, useValue: mockQuotaService },
       ],
     }).compile()
 
@@ -107,9 +114,9 @@ describe('PaymentController', () => {
     })
 
     it('should return order status', async () => {
-      mockOrderModel.findOne.mockReturnValueOnce({ exec: jest.fn().mockResolvedValue({ status: 'pending', plan: 'growth' }) })
+      mockOrderModel.findOne.mockReturnValueOnce({ exec: jest.fn().mockResolvedValue({ status: 'pending', plan: 'growth', type: 'membership' }) })
       const result = await controller.checkOrder('ORD123', mockUserId)
-      expect(result).toEqual({ status: 'pending', plan: 'growth' })
+      expect(result).toEqual({ status: 'pending', plan: 'growth', type: 'membership' })
       expect(mockOrderModel.findOne).toHaveBeenCalledWith({ outTradeNo: 'ORD123', userId: mockUserId })
     })
   })
@@ -128,19 +135,23 @@ describe('PaymentController', () => {
     })
 
     it('should activate growth plan', async () => {
-      mockOrderModel.findOne.mockReturnValueOnce({ exec: jest.fn().mockResolvedValue({ outTradeNo: 'ORD123', userId: mockUserId, status: 'success', plan: 'growth' }) })
+      mockOrderModel.findOne.mockReturnValueOnce({ exec: jest.fn().mockResolvedValue({ outTradeNo: 'ORD123', userId: mockUserId, status: 'success', plan: 'growth', type: 'membership' }) })
-      const mockUser = { plan: 'free', vipExpireAt: null, sprintExpireAt: null, sprintRemaining: 0, remaining: 0, save: jest.fn().mockResolvedValue(true) }
+      const mockUser = { plan: 'free', vipExpireAt: null, sprintExpireAt: null, sprintRemaining: 0, remaining: 0, interviewCredits: 1, resumeOptimizeCredits: 0, resumeDownloadCredits: 0, freeOptimizeUsed: 0, save: jest.fn().mockResolvedValue(true) }
       mockUserModel.findById.mockReturnValueOnce({ exec: jest.fn().mockResolvedValue(mockUser) })
 
       const result = await controller.activate(mockUserId, 'ORD123')
       expect(result.success).toBe(true)
       expect(result.plan).toBe('growth')
       expect(mockUser.save).toHaveBeenCalled()
+      expect(mockUser.plan).toBe('growth')
+      expect(mockUser.interviewCredits).toBe(999)
+      expect(mockUser.resumeOptimizeCredits).toBe(20)
+      expect(mockUser.resumeDownloadCredits).toBe(10)
     })
 
     it('should activate sprint plan', async () => {
-      mockOrderModel.findOne.mockReturnValueOnce({ exec: jest.fn().mockResolvedValue({ outTradeNo: 'ORD123', userId: mockUserId, status: 'success', plan: 'sprint' }) })
+      mockOrderModel.findOne.mockReturnValueOnce({ exec: jest.fn().mockResolvedValue({ outTradeNo: 'ORD123', userId: mockUserId, status: 'success', plan: 'sprint', type: 'membership' }) })
-      const mockUser = { plan: 'free', vipExpireAt: null, sprintExpireAt: null, sprintRemaining: 0, remaining: 0, save: jest.fn().mockResolvedValue(true) }
+      const mockUser = { plan: 'free', vipExpireAt: null, sprintExpireAt: null, sprintRemaining: 0, remaining: 0, interviewCredits: 1, resumeOptimizeCredits: 0, resumeDownloadCredits: 0, freeOptimizeUsed: 0, save: jest.fn().mockResolvedValue(true) }
       mockUserModel.findById.mockReturnValueOnce({ exec: jest.fn().mockResolvedValue(mockUser) })
 
       const result = await controller.activate(mockUserId, 'ORD123')

backend/src/modules/payment/payment.controller.ts

@@ -1,4 +1,4 @@
-import { Controller, Post, Get, Param, Query, Body, UseGuards, HttpException, HttpStatus, Logger, Req } from '@nestjs/common'
+import { Controller, Post, Get, Param, Body, UseGuards, HttpException, HttpStatus, Logger, Req } from '@nestjs/common'
 import { InjectModel } from '@nestjs/mongoose'
 import { Model } from 'mongoose'
 import { User, UserDocument } from '../user/user.schema'
@@ -6,12 +6,25 @@ import { PaymentOrder, PaymentOrderDocument } from './payment-order.schema'
 import { JwtAuthGuard } from '../../common/guards/jwt-auth.guard'
 import { CurrentUser } from '../../common/decorators/current-user.decorator'
 import { WechatPayService } from './wechat-pay.service'
+import { QuotaService } from '../user/quota.service'
 import { Public } from '../../common/decorators/public.decorator'
 
-const GROWTH_AMOUNT = 1990  // 19.9 元（分）
+const GROWTH_AMOUNT = 1990
-const SPRINT_AMOUNT = 4990  // 49.9 元（分）
+const SPRINT_AMOUNT = 4990
 const VIP_DURATION_DAYS = 30
 
+const PRODUCT_PRICES: Record<string, number> = {
+  interview: 500,
+  optimize: 300,
+  download: 200,
+}
+
+const PRODUCT_CREDITS: Record<string, number> = {
+  interview: 1,
+  optimize: 1,
+  download: 1,
+}
+
 @Controller('payment')
 export class PaymentController {
   private readonly logger = new Logger(PaymentController.name)
@@ -20,9 +33,10 @@ export class PaymentController {
     @InjectModel(User.name) private userModel: Model<UserDocument>,
     @InjectModel(PaymentOrder.name) private orderModel: Model<PaymentOrderDocument>,
     private wechatPay: WechatPayService,
+    private quotaService: QuotaService,
   ) {}
 
-  /** 创建订单（H5：Native 扫码支付） */
+  /** 创建套餐订单（H5：Native 扫码支付） */
   @UseGuards(JwtAuthGuard)
   @Post('create')
   async create(@CurrentUser('userId') userId: string, @Body('plan') plan: string = 'growth') {
@@ -36,11 +50,42 @@ export class PaymentController {
     const outTradeNo = `${plan === 'sprint' ? 'SPR' : 'VIP'}${Date.now()}${userId.slice(-6)}`
     const result = await this.wechatPay.nativePay(title, outTradeNo, amount)
 
-    await this.orderModel.create({ outTradeNo, userId, userPhone: user.phone || '', amount, title, status: 'pending', channel: 'native', plan })
+    await this.orderModel.create({ outTradeNo, userId, userPhone: user.phone || '', amount, title, status: 'pending', channel: 'native', type: 'membership', plan })
 
     return { outTradeNo, codeUrl: result.codeUrl, amount, title }
   }
 
+  /** 创建按次购买订单 */
+  @UseGuards(JwtAuthGuard)
+  @Post('create-product')
+  async createProduct(
+    @CurrentUser('userId') userId: string,
+    @Body('type') type: string,
+    @Body('metadata') metadata?: Record<string, any>,
+  ) {
+    if (!['interview', 'optimize', 'download'].includes(type)) {
+      throw new HttpException('无效产品类型', HttpStatus.BAD_REQUEST)
+    }
+    const user = await this.userModel.findById(userId).exec()
+    if (!user) throw new HttpException('用户不存在', HttpStatus.NOT_FOUND)
+
+    const price = PRODUCT_PRICES[type]
+    if (!price) throw new HttpException('价格未配置', HttpStatus.INTERNAL_SERVER_ERROR)
+
+    const titles: Record<string, string> = {
+      interview: 'AI 模拟面试单次',
+      optimize: '简历优化单次',
+      download: '简历下载',
+    }
+    const title = titles[type] || type
+    const outTradeNo = `${type.slice(0, 3).toUpperCase()}${Date.now()}${userId.slice(-6)}`
+    const result = await this.wechatPay.nativePay(title, outTradeNo, price)
+
+    await this.orderModel.create({ outTradeNo, userId, userPhone: user.phone || '', amount: price, title, status: 'pending', channel: 'native', type, plan: 'growth', metadata })
+
+    return { outTradeNo, codeUrl: result.codeUrl, amount: price, title }
+  }
+
   /** JSAPI 支付（微信小程序） */
   @UseGuards(JwtAuthGuard)
   @Post('jsapi')
@@ -57,7 +102,40 @@ export class PaymentController {
     const outTradeNo = `${plan === 'sprint' ? 'SPR' : 'VIP'}${Date.now()}${userId.slice(-6)}`
     const result = await this.wechatPay.jsapiPay(title, outTradeNo, amount, openid)
 
-    await this.orderModel.create({ outTradeNo, userId, userPhone: user.phone || '', amount, title, status: 'pending', channel: 'jsapi', plan })
+    await this.orderModel.create({ outTradeNo, userId, userPhone: user.phone || '', amount, title, status: 'pending', channel: 'jsapi', type: 'membership', plan })
+
+    return { ...result, outTradeNo }
+  }
+
+  /** JSAPI 按次购买 */
+  @UseGuards(JwtAuthGuard)
+  @Post('jsapi-product')
+  async jsapiProduct(
+    @CurrentUser('userId') userId: string,
+    @Body('type') type: string,
+    @Body('metadata') metadata?: Record<string, any>,
+  ) {
+    if (!['interview', 'optimize', 'download'].includes(type)) {
+      throw new HttpException('无效产品类型', HttpStatus.BAD_REQUEST)
+    }
+    const user = await this.userModel.findById(userId).exec()
+    if (!user) throw new HttpException('用户不存在', HttpStatus.NOT_FOUND)
+    const openid = user.wxOpenid
+    if (!openid) throw new HttpException('未绑定微信', HttpStatus.BAD_REQUEST)
+
+    const price = PRODUCT_PRICES[type]
+    if (!price) throw new HttpException('价格未配置', HttpStatus.INTERNAL_SERVER_ERROR)
+
+    const titles: Record<string, string> = {
+      interview: 'AI 模拟面试单次',
+      optimize: '简历优化单次',
+      download: '简历下载',
+    }
+    const title = titles[type] || type
+    const outTradeNo = `${type.slice(0, 3).toUpperCase()}${Date.now()}${userId.slice(-6)}`
+    const result = await this.wechatPay.jsapiPay(title, outTradeNo, price, openid)
+
+    await this.orderModel.create({ outTradeNo, userId, userPhone: user.phone || '', amount: price, title, status: 'pending', channel: 'jsapi', type, plan: 'growth', metadata })
 
     return { ...result, outTradeNo }
   }
@@ -65,10 +143,7 @@ export class PaymentController {
   /** 支付回调通知 */
   @Public()
   @Post('notify')
-  async notify(
+  async notify(@Body() body: any, @Req() req: any) {
-    @Body() body: any,
-    @Req() req: any,
-  ) {
     try {
       const wechatSignature = req.headers['wechatpay-signature'] || ''
       const wechatTimestamp = req.headers['wechatpay-timestamp'] || ''
@@ -79,7 +154,6 @@ export class PaymentController {
       const outTradeNo = decrypted.out_trade_no
       const wxTransactionId = decrypted.transaction_id
 
-      // 从数据库订单查找 userId，而非从 outTradeNo 解析
       const order = await this.orderModel.findOne({ outTradeNo }).exec()
       if (!order) {
         this.logger.warn(`支付回调：订单不存在 ${outTradeNo}`)
@@ -94,21 +168,10 @@ export class PaymentController {
         await order.save()
       }
 
-      // 根据订单 plan 激活对应套餐
+      if (order.type === 'membership') {
-      const user = await this.userModel.findById(order.userId).exec()
+        await this.activateMembership(order)
-      if (user && user.plan === 'free') {
+      } else {
-        const expireAt = new Date()
+        await this.activateProduct(order)
-        expireAt.setDate(expireAt.getDate() + VIP_DURATION_DAYS)
-        if (order.plan === 'sprint') {
-          user.plan = 'sprint'
-          user.sprintExpireAt = expireAt
-          user.sprintRemaining = 10   // 每月 10 次冲刺权益（语音分析+缺口分析）
-        } else {
-          user.plan = 'growth'
-          user.vipExpireAt = expireAt
-        }
-        user.remaining = 999
-        await user.save()
       }
       return { code: 'SUCCESS', message: '成功' }
     } catch (e) {
@@ -117,6 +180,47 @@ export class PaymentController {
     }
   }
 
+  private async activateMembership(order: PaymentOrderDocument) {
+    const user = await this.userModel.findById(order.userId).exec()
+    if (!user || user.plan !== 'free') return
+
+    const expireAt = new Date()
+    expireAt.setDate(expireAt.getDate() + VIP_DURATION_DAYS)
+    const isSprint = order.plan === 'sprint'
+    if (isSprint) {
+      user.plan = 'sprint'
+      user.sprintExpireAt = expireAt
+      user.sprintRemaining = 10
+    } else {
+      user.plan = 'growth'
+      user.vipExpireAt = expireAt
+    }
+    const credits = isSprint
+      ? { interview: 999, resumeOptimize: 50, resumeDownload: 30 }
+      : { interview: 999, resumeOptimize: 20, resumeDownload: 10 }
+    user.remaining = 999
+    user.interviewCredits = credits.interview
+    user.resumeOptimizeCredits = credits.resumeOptimize
+    user.resumeDownloadCredits = credits.resumeDownload
+    user.freeOptimizeUsed = 3
+    await user.save()
+  }
+
+  private async activateProduct(order: PaymentOrderDocument) {
+    const credits = PRODUCT_CREDITS[order.type]
+    if (!credits) return
+
+    const typeMap: Record<string, 'interview' | 'optimize' | 'download'> = {
+      interview: 'interview',
+      optimize: 'optimize',
+      download: 'download',
+    }
+    const mapped = typeMap[order.type]
+    if (mapped) {
+      await this.quotaService.grantCredits(order.userId, mapped, credits)
+    }
+  }
+
   /** 查询订单（微信侧） */
   @UseGuards(JwtAuthGuard)
   @Post('query')
@@ -132,32 +236,23 @@ export class PaymentController {
   async checkOrder(@Param('outTradeNo') outTradeNo: string, @CurrentUser('userId') userId: string) {
     const order = await this.orderModel.findOne({ outTradeNo, userId }).exec()
     if (!order) throw new HttpException('订单不存在', HttpStatus.NOT_FOUND)
-    return { status: order.status, plan: order.plan }
+    return { status: order.status, plan: order.plan, type: order.type }
   }
 
-  /** 凭订单号激活套餐（前端支付成功后调用，兜底） */
+  /** 凭订单号激活（前端支付成功后调用，兜底） */
   @UseGuards(JwtAuthGuard)
   @Post('activate')
   async activate(@CurrentUser('userId') userId: string, @Body('outTradeNo') outTradeNo: string) {
     const order = await this.orderModel.findOne({ outTradeNo, userId }).exec()
     if (!order) throw new HttpException('订单不存在', HttpStatus.NOT_FOUND)
     if (order.status !== 'success') throw new HttpException('支付未完成', HttpStatus.BAD_REQUEST)
-    const user = await this.userModel.findById(userId).exec()
-    if (!user) throw new HttpException('用户不存在', HttpStatus.NOT_FOUND)
-    if (user.plan !== 'free') return { success: true, plan: user.plan, message: '已是会员' }
 
-    const expireAt = new Date()
+    if (order.type === 'membership') {
-    expireAt.setDate(expireAt.getDate() + VIP_DURATION_DAYS)
+      await this.activateMembership(order)
-    if (order.plan === 'sprint') {
+      return { success: true, plan: order.plan }
-      user.plan = 'sprint'
-      user.sprintExpireAt = expireAt
-      user.sprintRemaining = 10
-    } else {
-      user.plan = 'growth'
-      user.vipExpireAt = expireAt
     }
-    user.remaining = 999
+
-    await user.save()
+    await this.activateProduct(order)
-    return { success: true, plan: user.plan }
+    return { success: true, type: order.type }
   }
 }

backend/src/modules/payment/payment.module.ts

@@ -3,14 +3,17 @@ import { MongooseModule } from '@nestjs/mongoose'
 import { PaymentController } from './payment.controller'
 import { WechatPayService } from './wechat-pay.service'
 import { User, UserSchema } from '../user/user.schema'
-
+import { UserModule } from '../user/user.module'
 import { PaymentOrder, PaymentOrderSchema } from './payment-order.schema'
 
 @Module({
-  imports: [MongooseModule.forFeature([
+  imports: [
-    { name: User.name, schema: UserSchema },
+    MongooseModule.forFeature([
-    { name: PaymentOrder.name, schema: PaymentOrderSchema },
+      { name: User.name, schema: UserSchema },
-  ])],
+      { name: PaymentOrder.name, schema: PaymentOrderSchema },
+    ]),
+    UserModule,
+  ],
   controllers: [PaymentController],
   providers: [WechatPayService],
   exports: [WechatPayService],

backend/src/modules/resume/resume-pdf.service.ts

@@ -0,0 +1,81 @@
+import * as crypto from 'crypto'
+import { Injectable, Logger } from '@nestjs/common'
+
+@Injectable()
+export class ResumePdfService {
+  private readonly logger = new Logger(ResumePdfService.name)
+
+  async generatePdf(params: {
+    title: string
+    content: string
+    targetPosition?: string
+    userName?: string
+  }): Promise<Buffer> {
+    const { default: puppeteer } = await import('puppeteer')
+    const html = this.buildHtml(params)
+    const browser = await puppeteer.launch({
+      executablePath: '/root/.cache/puppeteer/chrome/linux-149.0.7827.22/chrome-linux64/chrome',
+      args: ['--no-sandbox', '--disable-setuid-sandbox', '--disable-dev-shm-usage'],
+    })
+    try {
+      const page = await browser.newPage()
+      await page.setContent(html, { waitUntil: 'load' })
+      const pdf = await page.pdf({
+        format: 'A4',
+        printBackground: true,
+        margin: { top: '20mm', bottom: '20mm', left: '15mm', right: '15mm' },
+      })
+      return Buffer.from(pdf)
+    } finally {
+      await browser.close()
+    }
+  }
+
+  private buildHtml(params: {
+    title: string
+    content: string
+    targetPosition?: string
+    userName?: string
+  }): string {
+    const contentHtml = params.content
+      .replace(/\n/g, '<br>')
+      .replace(/### (.+)/g, '<h3>$1</h3>')
+      .replace(/\*\*(.+?)\*\*/g, '<strong>$1</strong>')
+
+    return `<!DOCTYPE html>
+<html lang="zh-CN">
+<head>
+<meta charset="UTF-8">
+<style>
+  @page { size: A4; margin: 0; }
+  body {
+    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
+    font-size: 12pt; line-height: 1.6; color: #333; padding: 0; margin: 0;
+  }
+  .page { padding: 40px 30px; max-width: 210mm; margin: 0 auto; }
+  h1 { font-size: 22pt; color: #1a1a1a; margin-bottom: 4px; }
+  .subtitle { color: #666; font-size: 10pt; margin-bottom: 20px; }
+  h2 { font-size: 14pt; color: #2c6b9e; border-bottom: 2px solid #2c6b9e; padding-bottom: 4px; margin-top: 20px; }
+  h3 { font-size: 12pt; color: #333; margin-top: 12px; margin-bottom: 4px; }
+  strong { color: #1a1a1a; }
+  p { margin: 6px 0; }
+  ul { margin: 4px 0; padding-left: 20px; }
+  li { margin: 2px 0; }
+  .footer { margin-top: 30px; font-size: 9pt; color: #999; text-align: center; border-top: 1px solid #eee; padding-top: 10px; }
+</style>
+</head>
+<body>
+<div class="page">
+  <h1>${params.title}</h1>
+  <div class="subtitle">${params.targetPosition ? `目标岗位: ${params.targetPosition}` : ''}</div>
+  <div class="content">${contentHtml}</div>
+  <div class="footer">由 AI磁场·职引 生成</div>
+</div>
+</body>
+</html>`
+  }
+
+  computeHash(content: string): string {
+    return crypto.createHash('md5').update(content).digest('hex')
+  }
+}

backend/src/modules/resume/resume.controller.ts

@@ -1,10 +1,17 @@
-import { Controller, Post, Get, Delete, Param, Body } from '@nestjs/common'
+import { Controller, Post, Get, Delete, Param, Body, Res, HttpException, HttpStatus } from '@nestjs/common'
+import { Response } from 'express'
 import { ResumeService } from './resume.service'
+import { ResumePdfService } from './resume-pdf.service'
+import { QuotaService } from '../user/quota.service'
 import { CurrentUser } from '../../common/decorators/current-user.decorator'
 
 @Controller('resume')
 export class ResumeController {
-  constructor(private resumeService: ResumeService) {}
+  constructor(
+    private resumeService: ResumeService,
+    private resumePdfService: ResumePdfService,
+    private quotaService: QuotaService,
+  ) {}
 
   @Post('create')
   async create(
@@ -21,6 +28,31 @@ export class ResumeController {
     return this.resumeService.list(userId)
   }
 
+  @Post(':id/download')
+  async download(@Param('id') id: string, @CurrentUser('userId') userId: string, @Res() res: Response) {
+    const resume = await this.resumeService.getDetail(id, userId)
+
+    const canDownload = await this.quotaService.checkDownload(userId, resume)
+    if (!canDownload) {
+      throw new HttpException('请先付费下载', HttpStatus.PAYMENT_REQUIRED)
+    }
+
+    await this.quotaService.deductDownload(userId, resume)
+    if (!resume.paidDownload) {
+      await this.resumeService.markPaid(id, userId)
+    }
+
+    const pdf = await this.resumePdfService.generatePdf({
+      title: resume.title,
+      content: resume.content,
+      targetPosition: resume.targetPosition,
+    })
+
+    res.setHeader('Content-Type', 'application/pdf')
+    res.setHeader('Content-Disposition', `attachment; filename="${encodeURIComponent(resume.title)}.pdf"`)
+    res.send(pdf)
+  }
+
   @Get(':id')
   async getDetail(@Param('id') id: string, @CurrentUser('userId') userId: string) {
     return this.resumeService.getDetail(id, userId)

backend/src/modules/resume/resume.module.ts

@@ -2,11 +2,17 @@ import { Module } from '@nestjs/common'
 import { MongooseModule } from '@nestjs/mongoose'
 import { ResumeController } from './resume.controller'
 import { ResumeService } from './resume.service'
+import { ResumePdfService } from './resume-pdf.service'
 import { Resume, ResumeSchema } from './resume.schema'
+import { UserModule } from '../user/user.module'
 
 @Module({
-  imports: [MongooseModule.forFeature([{ name: Resume.name, schema: ResumeSchema }])],
+  imports: [
+    MongooseModule.forFeature([{ name: Resume.name, schema: ResumeSchema }]),
+    UserModule,
+  ],
   controllers: [ResumeController],
-  providers: [ResumeService],
+  providers: [ResumeService, ResumePdfService],
+  exports: [ResumeService],
 })
 export class ResumeModule {}

backend/src/modules/resume/resume.schema.ts

@@ -17,6 +17,15 @@ export class Resume {
   @Prop({ default: '' })
   targetPosition: string
 
+  @Prop({ default: 1 })
+  version: number
+
+  @Prop({ default: '' })
+  contentHash: string
+
+  @Prop({ default: false })
+  paidDownload: boolean
+
   readonly createdAt?: Date
   readonly updatedAt?: Date
 }

backend/src/modules/resume/resume.service.ts

@@ -1,3 +1,4 @@
+import * as crypto from 'crypto'
 import { Injectable, HttpException, HttpStatus } from '@nestjs/common'
 import { InjectModel } from '@nestjs/mongoose'
 import { Model } from 'mongoose'
@@ -8,7 +9,8 @@ export class ResumeService {
   constructor(@InjectModel(Resume.name) private resumeModel: Model<ResumeDocument>) {}
 
   async create(userId: string, title: string, content: string, targetPosition?: string) {
-    const resume = await this.resumeModel.create({ userId, title, content, targetPosition })
+    const contentHash = crypto.createHash('md5').update(content).digest('hex')
+    const resume = await this.resumeModel.create({ userId, title, content, targetPosition, contentHash, version: 1 })
     return resume.toObject()
   }
 
@@ -18,6 +20,9 @@ export class ResumeService {
       id: r._id.toString(),
       title: r.title,
       targetPosition: r.targetPosition,
+      version: r.version,
+      contentHash: r.contentHash,
+      paidDownload: r.paidDownload,
       createdAt: r.createdAt,
     }))
   }
@@ -28,6 +33,30 @@ export class ResumeService {
     return resume.toObject()
   }
 
+  /** AI 优化后更新内容，若内容变化则新建版本 */
+  async updateAfterOptimize(resumeId: string, userId: string, newContent: string, targetPosition?: string) {
+    const resume = await this.resumeModel.findOne({ _id: resumeId, userId }).exec()
+    if (!resume) throw new HttpException('简历不存在', HttpStatus.NOT_FOUND)
+
+    const newHash = crypto.createHash('md5').update(newContent).digest('hex')
+    if (newHash === resume.contentHash) return resume.toObject()
+
+    // Same user, increment version as new record
+    const created = await this.resumeModel.create({
+      userId,
+      title: resume.title,
+      content: newContent,
+      targetPosition: targetPosition || resume.targetPosition,
+      contentHash: newHash,
+      version: (resume.version || 1) + 1,
+    })
+    return created.toObject()
+  }
+
+  async markPaid(resumeId: string, userId: string) {
+    await this.resumeModel.updateOne({ _id: resumeId, userId }, { paidDownload: true }).exec()
+  }
+
   async delete(resumeId: string, userId: string) {
     const res = await this.resumeModel.deleteOne({ _id: resumeId, userId }).exec()
     if (res.deletedCount === 0) throw new HttpException('简历不存在', HttpStatus.NOT_FOUND)

backend/src/modules/user/quota.service.ts

@@ -0,0 +1,92 @@
+import { Injectable, HttpException, HttpStatus } from '@nestjs/common'
+import { InjectModel } from '@nestjs/mongoose'
+import { Model } from 'mongoose'
+import { User, UserDocument } from './user.schema'
+
+const FREE_OPTIMIZE_LIMIT = 3
+
+@Injectable()
+export class QuotaService {
+  constructor(
+    @InjectModel(User.name) private userModel: Model<UserDocument>,
+  ) {}
+
+  async checkAndDeductInterview(userId: string) {
+    const user = await this.userModel.findById(userId).exec()
+    if (!user) throw new HttpException('用户不存在', HttpStatus.NOT_FOUND)
+    if (user.plan !== 'free') return
+
+    if ((user.interviewCredits || 0) <= 0) {
+      throw new HttpException('面试次数已用完，请购买面试次数或开通会员', HttpStatus.FORBIDDEN)
+    }
+    user.interviewCredits = (user.interviewCredits || 0) - 1
+    user.interviewCount = (user.interviewCount || 0) + 1
+    await user.save()
+  }
+
+  async checkAndDeductOptimize(userId: string) {
+    const user = await this.userModel.findById(userId).exec()
+    if (!user) throw new HttpException('用户不存在', HttpStatus.NOT_FOUND)
+    if (user.plan !== 'free') return
+
+    // 优先扣付费额度
+    if ((user.resumeOptimizeCredits || 0) > 0) {
+      user.resumeOptimizeCredits = (user.resumeOptimizeCredits || 0) - 1
+      await user.save()
+      return
+    }
+
+    // 免费额度
+    if ((user.freeOptimizeUsed || 0) < FREE_OPTIMIZE_LIMIT) {
+      user.freeOptimizeUsed = (user.freeOptimizeUsed || 0) + 1
+      await user.save()
+      return
+    }
+
+    throw new HttpException('简历优化次数已用完，请购买优化次数或开通会员', HttpStatus.FORBIDDEN)
+  }
+
+  async checkDownload(userId: string, resume: { paidDownload?: boolean }): Promise<boolean> {
+    const user = await this.userModel.findById(userId).exec()
+    if (!user) throw new HttpException('用户不存在', HttpStatus.NOT_FOUND)
+
+    if (resume.paidDownload) return true
+    if ((user.resumeDownloadCredits || 0) > 0) return true
+    return false
+  }
+
+  async deductDownload(userId: string, resume: { paidDownload?: boolean; _id?: any }) {
+    const user = await this.userModel.findById(userId).exec()
+    if (!user) throw new HttpException('用户不存在', HttpStatus.NOT_FOUND)
+
+    if (resume.paidDownload) return
+    if ((user.resumeDownloadCredits || 0) > 0) {
+      user.resumeDownloadCredits = (user.resumeDownloadCredits || 0) - 1
+      await user.save()
+    }
+  }
+
+  async grantCredits(userId: string, type: 'interview' | 'optimize' | 'download', amount: number) {
+    const user = await this.userModel.findById(userId).exec()
+    if (!user) throw new HttpException('用户不存在', HttpStatus.NOT_FOUND)
+
+    if (type === 'interview') user.interviewCredits = (user.interviewCredits || 0) + amount
+    else if (type === 'optimize') user.resumeOptimizeCredits = (user.resumeOptimizeCredits || 0) + amount
+    else if (type === 'download') user.resumeDownloadCredits = (user.resumeDownloadCredits || 0) + amount
+
+    await user.save()
+  }
+
+  async setPlanQuota(userId: string, plan: string, credits: { interview: number; resumeOptimize: number; resumeDownload: number }) {
+    const user = await this.userModel.findById(userId).exec()
+    if (!user) throw new HttpException('用户不存在', HttpStatus.NOT_FOUND)
+
+    user.remaining = 999
+    user.interviewCredits = credits.interview
+    user.resumeOptimizeCredits = credits.resumeOptimize
+    user.resumeDownloadCredits = credits.resumeDownload
+    user.freeOptimizeUsed = FREE_OPTIMIZE_LIMIT  // 会员不再消耗免费次数
+
+    await user.save()
+  }
+}

backend/src/modules/user/user.module.ts

@@ -3,6 +3,7 @@ import { MongooseModule } from '@nestjs/mongoose'
 import { JwtModule } from '@nestjs/jwt'
 import { UserController } from './user.controller'
 import { UserService } from './user.service'
+import { QuotaService } from './quota.service'
 import { User, UserSchema } from './user.schema'
 
 @Module({
@@ -14,7 +15,7 @@ import { User, UserSchema } from './user.schema'
     }),
   ],
   controllers: [UserController],
-  providers: [UserService],
+  providers: [UserService, QuotaService],
-  exports: [UserService],
+  exports: [UserService, QuotaService],
 })
 export class UserModule {}

backend/src/modules/user/user.schema.ts

@@ -35,6 +35,19 @@ export class User {
   @Prop({ default: 0 })
   sprintRemaining: number  // 冲刺版剩余次数（语音分析等）
 
+  // --- 新版独立额度（产品改造 v2） ---
+  @Prop({ default: 1 })
+  interviewCredits: number       // AI 面试可用次数（含首次免费）
+
+  @Prop({ default: 0 })
+  resumeOptimizeCredits: number  // 简历优化可用次数
+
+  @Prop({ default: 0 })
+  resumeDownloadCredits: number  // 简历下载可用次数
+
+  @Prop({ default: 0 })
+  freeOptimizeUsed: number       // 已使用免费优化次数（上限 3）
+
   @Prop({ default: 'user' })
   role: string       // 'user' | 'admin'
 

backend/src/modules/user/user.service.ts

@@ -211,6 +211,10 @@ export class UserService {
       isSystemAdmin: user.isSystemAdmin || false,
       remaining: user.remaining,
       interviewCount: user.interviewCount,
+      interviewCredits: user.interviewCredits ?? 1,
+      resumeOptimizeCredits: user.resumeOptimizeCredits ?? 0,
+      resumeDownloadCredits: user.resumeDownloadCredits ?? 0,
+      freeOptimizeUsed: user.freeOptimizeUsed ?? 0,
     }
   }
 }

docs/PAYMENT-REDESIGN.md

@@ -0,0 +1,299 @@
+# 产品改造方案：付费体系重构 + 数字人面试
+
+> 2026-06-11 · v1.0
+
+## 概述
+
+将现有一刀切的 `remaining` 免费额度模式，改为**按产品线独立计费 + 会员套餐含额度 + 数据库配置化**的灵活付费体系。
+
+## 数据库模型变更
+
+### User Schema 新增字段
+
+| 字段 | 类型 | 默认值 | 说明 |
+|------|------|--------|------|
+| `interviewCredits` | number | 1 | AI 数字人面试可用次数（含首次免费） |
+| `resumeOptimizeCredits` | number | 0 | 简历优化可用次数 |
+| `resumeDownloadCredits` | number | 0 | 简历下载可用次数 |
+| `freeOptimizeUsed` | number | 0 | 已使用免费优化次数（上限 3） |
+
+旧的 `remaining` 字段保留，仅限老用户兼容，新逻辑不再使用。
+
+### Resume Schema 新增字段
+
+| 字段 | 类型 | 默认值 | 说明 |
+|------|------|--------|------|
+| `version` | number | 1 | 版本号，每次 AI 改写 +1 |
+| `contentHash` | string | '' | 内容 MD5，用于判断是否改版 |
+| `paidDownload` | boolean | false | 是否已购买该版本的下载权 |
+
+`contentHash` 在 create 和 optimize 后自动更新。
+
+### PaymentOrder Schema 新增字段
+
+| 字段 | 类型 | 默认值 | 说明 |
+|------|------|--------|------|
+| `type` | string | 'membership' | `membership` / `interview` / `optimize` / `download` |
+| `metadata` | Mixed | {} | 产品粒度信息（如 `{ resumeId, version }`） |
+
+### 定价配置（SiteConfig key=`pricing`）
+
+单一配置源，所有定价和套餐内容后台可编辑：
+
+```json
+{
+  "interview": {
+    "firstFree": true,
+    "pricePerSession": 500,
+    "creditsPerPurchase": 1
+  },
+  "resumeOptimize": {
+    "freeLimit": 3,
+    "pricePerOptimize": 300,
+    "creditsPerPurchase": 1
+  },
+  "resumeDownload": {
+    "pricePerDownload": 200,
+    "creditsPerPurchase": 1
+  },
+  "plans": {
+    "growth": {
+      "price": 1990,
+      "durationDays": 30,
+      "credits": {
+        "interview": 999,
+        "resumeOptimize": 20,
+        "resumeDownload": 10
+      },
+      "features": [
+        "免费版全部权益",
+        "AI 数字人面试无限次",
+        "详细面试报告（四维评分）",
+        "进步轨迹雷达图 + 打卡",
+        "每日一题推送",
+        "参考回答思路",
+        "公司真题库"
+      ]
+    },
+    "sprint": {
+      "price": 4990,
+      "durationDays": 30,
+      "credits": {
+        "interview": 999,
+        "resumeOptimize": 50,
+        "resumeDownload": 30
+      },
+      "features": [
+        "成长版全部权益",
+        "AI 语音分析（语气词/语速检测）",
+        "技能缺口分析报告",
+        "学习路径推荐",
+        "真人导师 1v1 点评（每月 1 次）",
+        "简历精修（每月 1 次）",
+        "内推优先"
+      ]
+    }
+  }
+}
+```
+
+## 配额检查逻辑
+
+所有配额检查收敛到统一的 `QuotaGuard` 或 `QuotaService`，不再散落在各处。
+
+```typescript
+// 配额服务
+class QuotaService {
+  checkInterview(user):  // user.interviewCredits >= 1
+  checkOptimize(user):   // user.resumeOptimizeCredits > 0
+                         //   || user.freeOptimizeUsed < freeLimit
+  checkDownload(user, resume):  // resume.paidDownload
+                                //   || user.resumeDownloadCredits > 0
+
+  deductInterview(user)
+  deductOptimize(user)
+  deductDownload(user, resume)
+}
+```
+
+### 各类用户行为对应的检查
+
+| 行为 | 检查条件 | 扣减项 |
+|------|----------|--------|
+| 开始 AI 面试 | `interviewCredits >= 1` | `interviewCredits -= 1` |
+| AI 诊断/优化简历 | `resumeOptimizeCredits > 0 \|\| freeOptimizeUsed < 3` | 付费优先扣，免费次之 |
+| 下载简历 PDF | `resume.paidDownload \|\| resumeDownloadCredits > 0` | 标记 resume.paidDownload |
+
+## 支付流程扩展
+
+### 现有：套餐购买（不变）
+
+```
+POST /payment/create { plan: 'growth' | 'sprint' }
+  → 创建 Membership 订单（type='membership'）
+  → WeChat Pay
+  → 回调/activate → 注入 plan 对应的全部 credits
+```
+
+### 新增：按次购买
+
+```
+POST /payment/create-product { type, resumeId?, count? }
+  → 从 pricing config 读取单价
+  → 创建对应 type 订单
+  → WeChat Pay
+  → 回调 → 根据 type 增加对应用户 credits / 标记下载
+```
+
+支持的产品：
+- `interview`：增加 `interviewCredits`
+- `optimize`：增加 `resumeOptimizeCredits`
+- `download`：标记 `resume.paidDownload=true`
+
+## 数字人面试架构
+
+### 整体流程
+
+```
+用户选择岗位 → 配额检查 → AI 出题 → 回答
+  → AI 评分+下一题 → ... → 完成 → 报告 → 头像回顾视频(可选)
+```
+
+每次 AI 回复时，同步调用 TTS 生成音频，返回给前端：
+
+```typescript
+// 面试回答响应
+{
+  text: "请介绍一下你的项目经验",
+  audioUrl: "/tts/cache/abc123.mp3",  // edge-tts 生成
+  durationMs: 2800,                    // 音频时长
+  animationTimings: [],                // 可选：逐字时间戳
+}
+```
+
+### TTS 服务
+
+`backend/src/modules/tts/tts.service.ts`
+
+```typescript
+class TtsService {
+  async synthesize(text: string): Promise<{ audioPath: string; durationMs: number }> {
+    // 1. 按 text MD5 检查缓存
+    // 2. 未命中 → child_process.exec('edge-tts ...')
+    // 3. 保存到 /tmp/tts-cache/ 或 certs 同目录
+    // 4. 返回路径和时长
+  }
+}
+```
+
+edge-tts 命令示例：
+```bash
+edge-tts --voice zh-CN-XiaoxiaoNeural --text "你好" --write-media /tmp/tts-cache/abc.mp3
+```
+
+### 前端数字人组件
+
+`zhiyin-app/src/components/digital-human.vue`
+
+```
+┌─────────────────────┐
+│     ┌───────┐       │
+│     │ 头像   │       │  ← 静态 PNG + CSS呼吸/眨眼
+│     │ (嘴型) │       │  ← Canvas 覆盖嘴部区域
+│     └───────┘       │
+│   "请介绍你的项目"    │  ← 字幕气泡
+│                     │
+│  [▼ 音频波形]       │  ← 可选
+└─────────────────────┘
+```
+
+嘴型驱动：
+1. `AudioContext.createMediaElementSource(audioEl)` → `AnalyserNode`
+2. 每帧读取 `analyser.getByteTimeDomainData(dataArray)`
+3. 计算 RMS → 映射到嘴型开合度 (0~1)
+4. Canvas 绘制椭圆（开）或线（闭）
+
+### 新接口
+
+| 方法 | 路径 | 说明 |
+|------|------|------|
+| POST | `/interview/create-avatar` | 创建数字人面试（含配额检查） |
+| POST | `/interview/:id/answer-avatar` | 回答+AI 回复（含 TTS audioUrl） |
+| GET | `/tts/:hash` | 获取 TTS 音频文件 |
+
+## 简历下载流程图
+
+```
+用户查看优化结果
+  │
+  ├─ 点击「下载 PDF」
+  │    │
+  │    ├─ resume.paidDownload === true → 直接生成 → 返回 PDF
+  │    │
+  │    └─ resume.paidDownload === false
+  │         │
+  │         ├─ user.resumeDownloadCredits > 0
+  │         │   → 扣 1 credit → 标记 paidDownload → 生成 PDF
+  │         │
+  │         └─ 无 credits
+  │             → 弹出支付窗口（¥X/次）
+  │             → WeChat Pay → 标记 paidDownload → 生成 PDF
+  │
+  └─ 再次优化（内容改变）
+      → contentHash 变化 → 新 resume 记录（version++）
+      → paidDownload = false
+      → 需重新付费下载
+```
+
+Puppeteer PDF 生成 (`resume-pdf.service.ts`)：
+1. 读取 resume.content（markdown/HTML）
+2. 套用模板（含姓名、岗位、日期等）
+3. `puppeteer.launch()` → `page.setContent(html)` → `page.pdf({ format: 'A4' })`
+4. 返回 PDF buffer
+5. 可选：同时生成 Word（用 HTML → mammoth 或 libreoffice）
+
+## 管理后台配置
+
+在现有 `admin.vue` 的 Config Tab 中增加：
+
+```
+┌─────────────────────────────────────────────┐
+│  定价配置                          [保存]   │
+│                                             │
+│  AI 面试单价          ¥ [ 5  ] /次          │
+│  简历优化单价          ¥ [ 3  ] /次          │
+│  简历下载单价          ¥ [ 2  ] /次          │
+│  免费优化次数          [ 3  ] 次             │
+│  首次面试免费          [✓]                   │
+│                                             │
+│  ─── 成长版 ───                             │
+│  价格                ¥ [ 19.9 ] /月         │
+│  面试额度              [ 999  ] 次           │
+│  优化额度              [ 20   ] 次           │
+│  下载额度              [ 10   ] 次           │
+│  功能列表              [编辑]                │
+│                                             │
+│  ─── 冲刺版 ───                             │
+│  ...                                        │
+└─────────────────────────────────────────────┘
+```
+
+## 实施优先级
+
+| 阶段 | 内容 | 文件涉及 |
+|------|------|----------|
+| P0-1 | 定价配置化 + User 新字段 + 统一配额检查 | user.schema, SiteConfig, QuotaService |
+| P0-2 | 简历下载付费 + Puppeteer PDF | resume.schema, resume.service, resume.controller, ResumePdfService |
+| P0-3 | 支付扩展（按次购买） | payment-order.schema, payment.controller |
+| P1-1 | TTS 服务 | tts.service, tts.controller, tts.module |
+| P1-2 | 数字人面试前端组件 | digital-human.vue, interview.vue |
+| P1-3 | 面试接口改版 + 配额接入 | interview.service, interview.controller |
+| P2 | Admin 定价管理界面 | admin.vue, admin.controller |
+
+## 兼容性注意事项
+
+- `remaining` 字段保留，老用户数据不受影响
+- 新用户注册默认 `interviewCredits=1`（首次免费）
+- 会员激活时注入 plan 定义的 credits
+- 过期降级时不清零已购买的 credits，仅阻止会员专属 privileges
+- 已购买的单次 credits 不过期