feat: refactor member to pay-per-use gravity purchase; mv webview to clipboard+browser

- member.vue: rewrite from subscription plans (free/growth/sprint) to
  H5-only pay-per-use gravity purchase with quantity selector + QR code
- user.vue: gravity card replacing quota card, add share/contribute/H5-buy
  entry points, plus gravity acquisition modal (share/contribute/buy)
- share.vue: layout fix (flex column), smarter copyLink with cached URL,
  WeChat timeline hint instead of open-type
- share.controller.ts: add GET /:shareCode redirect route (IP record + 302)
- interview.vue: guest mode fix, H5 buy modal, clipboard copy instead of
  webview for mini-program
- App.vue: handleH5UrlParams for ?token=&buy=gravity auto-login
- composables/useGravityPurchase.ts: reusable gravity purchase composable
- remove webview.vue (no longer used), replace with clipboard+browser flow
- AGENTS.md: sync all above changes, fix duplicate numbering

backend/src/modules/schedule/schedule.module.ts

@@ -6,7 +6,6 @@ import { VipExpiryService } from './vip-expiry.service'
 import { GravityTopUpService } from './gravity-top-up.service'
 import { DailyQuestion, DailyQuestionSchema } from '../schemas/daily-question.schema'
 import { User, UserSchema } from '../user/user.schema'
-import { PricingService } from '../schemas/pricing.service'
 
 @Module({
   imports: [
@@ -15,6 +14,6 @@ import { PricingService } from '../schemas/pricing.service'
       { name: User.name, schema: UserSchema },
     ]),
   ],
-  providers: [WechatTokenService, DailyQuestionPushService, VipExpiryService, GravityTopUpService, PricingService],
+  providers: [WechatTokenService, DailyQuestionPushService, VipExpiryService, GravityTopUpService],
 })
 export class ScheduleModule {}

backend/src/modules/share/share.controller.ts

@@ -1,9 +1,11 @@
-import { Controller, Get, Post, Body, Param, Query, HttpException, HttpStatus, UseGuards } from '@nestjs/common'
+import { Controller, Get, Post, Body, Param, Query, HttpException, HttpStatus, UseGuards, Req, Res } from '@nestjs/common'
+import { Request, Response } from 'express'
 import { JwtService } from '@nestjs/jwt'
 import { ShareService } from './share.service'
 import { JwtAuthGuard } from '../../common/guards/jwt-auth.guard'
 import { CurrentUser } from '../../common/decorators/current-user.decorator'
 import { Public } from '../../common/decorators/public.decorator'
+import * as crypto from 'crypto'
 
 @Controller('share')
 export class ShareController {
@@ -66,4 +68,27 @@ export class ShareController {
   ) {
     return this.shareService.visitors(userId, Number(page) || 1, Number(pageSize) || 20)
   }
+
+  // 泛匹配路由放在最后，避免拦截 stats/records/visitors 等
+  @Public()
+  @Get(':shareCode')
+  async redirect(
+    @Param('shareCode') shareCode: string,
+    @Req() req: Request,
+    @Res() res: Response,
+  ) {
+    try {
+      const ip = req.ip || req.socket?.remoteAddress || 'unknown'
+      const visitorId = crypto.createHash('md5').update(ip).digest('hex').slice(0, 16)
+      let visitorUserId: string | undefined
+      const token = req.query.token as string | undefined
+      if (token) {
+        try { const payload = this.jwtService.verify(token) as any; visitorUserId = payload.userId } catch {}
+      }
+      await this.shareService.visit(shareCode, visitorId, visitorUserId)
+    } catch (e) {
+      // 访问记录失败不影响跳转
+    }
+    res.redirect(HttpStatus.FOUND, `https://zhiyin.yzrcloud.cn/?share=${shareCode}`)
+  }
 }