feat: 品牌更新 + 每日一题公开随机 + 面试计时器修复 + 反馈功能 + 营销文案

- 品牌名统一：职引 → 宇之然AI磁场，SEO 双名策略保留搜索关键词
- 每日一题：放开未登录访问，后端改用 \ 随机取题，灌入 23 题覆盖 8 个岗位
- 面试计时器：timerSeconds 改为 ref 修复 UI 不更新，完成自动停止，增加轮次提示
- 反馈功能：FeedbackModule 前后端完整实现 + admin 面板 + Playwright 测试
- 管理后台：所有列表分页改为 limit=10 + 加载更多按钮
- 录音 UX：修复异步竞态 + 点击开始/停止 + 空语音友好提示 + 发送按钮录音中禁用
- 营销文案：三端平台（公众号/知乎/小红书）推广方案 + 可复制 HTML 文件

backend/package.json

@@ -1,7 +1,7 @@
 {
   "name": "zhiyin-backend",
   "version": "1.0.0",
-  "description": "职引 - AI简历优化后端服务",
+  "description": "宇之然AI磁场 - AI简历优化后端服务",
   "main": "dist/src/main.js",
   "scripts": {
     "start": "nest start",

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

@@ -10,6 +10,7 @@ import { Resume, ResumeDocument } from '../resume/resume.schema'
 import { PaymentOrder, PaymentOrderDocument } from '../payment/payment-order.schema'
 import { SiteConfig, SiteConfigDocument } from '../schemas/site-config.schema'
 import { ShareRecord, ShareRecordDocument, ShareVisit, ShareVisitDocument } from '../share/share.schema'
+import { Feedback, FeedbackDocument } from '../feedback/feedback.schema'
 import { QuotaService } from '../user/quota.service'
 import { PricingService } from '../schemas/pricing.service'
 import { WechatPayService } from '../payment/wechat-pay.service'
@@ -27,6 +28,7 @@ export class AdminController {
     @InjectModel(ShareRecord.name) private shareModel: Model<ShareRecordDocument>,
     @InjectModel(ShareVisit.name) private shareVisitModel: Model<ShareVisitDocument>,
     @InjectModel(Resume.name) private resumeModel: Model<ResumeDocument>,
+    @InjectModel(Feedback.name) private feedbackModel: Model<FeedbackDocument>,
     private quotaService: QuotaService,
     private pricingService: PricingService,
     private wechatPay: WechatPayService,
@@ -223,6 +225,16 @@ export class AdminController {
     return { list, total, page: +page }
   }
 
+  @Get('feedback')
+  async getFeedback(@Query('page') page = '1', @Query('limit') limit = '10') {
+    const skip = (Math.max(1, +page) - 1) * +limit
+    const [list, total] = await Promise.all([
+      this.feedbackModel.find().sort({ createdAt: -1 }).skip(skip).limit(+limit).lean().exec(),
+      this.feedbackModel.countDocuments().exec(),
+    ])
+    return { list, total, page: +page }
+  }
+
   @Get('resumes')
   async getResumes(@Query('page') page = '1', @Query('limit') limit = '20') {
     const skip = (Math.max(1, +page) - 1) * +limit

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

@@ -10,6 +10,7 @@ import { AdminGuard } from '../../common/guards/admin.guard'
 import { SiteConfig, SiteConfigSchema } from '../schemas/site-config.schema'
 import { ShareRecord, ShareRecordSchema, ShareVisit, ShareVisitSchema } from '../share/share.schema'
 import { Resume, ResumeSchema } from '../resume/resume.schema'
+import { Feedback, FeedbackSchema } from '../feedback/feedback.schema'
 
 @Module({
   imports: [
@@ -21,6 +22,7 @@ import { Resume, ResumeSchema } from '../resume/resume.schema'
       { name: ShareRecord.name, schema: ShareRecordSchema },
       { name: ShareVisit.name, schema: ShareVisitSchema },
       { name: Resume.name, schema: ResumeSchema },
+      { name: Feedback.name, schema: FeedbackSchema },
     ]),
     UserModule,
   ],

backend/src/modules/daily-question/daily-question.controller.ts

@@ -1,40 +1,37 @@
-import { Controller, Get, Param, Query, UseGuards } from '@nestjs/common'
+import { Controller, Get, Param, Query } from '@nestjs/common'
 import { InjectModel } from '@nestjs/mongoose'
 import { Model } from 'mongoose'
-import { JwtAuthGuard } from '../../common/guards/jwt-auth.guard'
+import { Public } from '../../common/decorators/public.decorator'
 import { DailyQuestion, DailyQuestionDocument } from '../schemas/daily-question.schema'
 
 @Controller('daily-question')
-@UseGuards(JwtAuthGuard)
 export class DailyQuestionController {
   constructor(
     @InjectModel(DailyQuestion.name) private dailyQuestionModel: Model<DailyQuestionDocument>,
   ) {}
 
   @Get()
-  async getToday(@Query('position') position?: string) {
-    const filter: any = {}
-    if (position) filter.position = position
+  @Public()
+  async getRandom(@Query('position') position?: string) {
+    const pipeline: any[] = []
+    if (position) pipeline.push({ $match: { position } })
+    pipeline.push({ $sample: { size: 1 } })
 
-    const question = await this.dailyQuestionModel
-      .findOne(filter)
-      .sort({ date: -1 })
-      .exec()
+    const results = await this.dailyQuestionModel.aggregate(pipeline).exec()
+    if (results.length > 0) return results[0]
 
-    if (!question) {
-      // Return a default question if no specific one found
-      const defaultQ = await this.dailyQuestionModel.findOne().sort({ date: -1 }).exec()
-      if (defaultQ) return defaultQ
-
-      return {
-        position: '通用',
-        question: '请做一个简单的自我介绍，突出你的核心优势和职业目标。',
-        referenceAnswer: '建议结构：1) 基本信息 2) 教育背景与专业 3) 实习/项目经历中的亮点 4) 为什么选择这个岗位 5) 职业目标。控制在1-2分钟内。',
-        category: 'behavioral',
-      }
+    // Fallback: try without position filter
+    if (position) {
+      const fallback = await this.dailyQuestionModel.aggregate([{ $sample: { size: 1 } }]).exec()
+      if (fallback.length > 0) return fallback[0]
     }
 
-    return question
+    return {
+      position: '通用',
+      question: '请做一个简单的自我介绍，突出你的核心优势和职业目标。',
+      referenceAnswer: '建议结构：1) 基本信息 2) 教育背景与专业 3) 实习/项目经历中的亮点 4) 为什么选择这个岗位 5) 职业目标。控制在1-2分钟内。',
+      category: 'behavioral',
+    }
   }
 
   @Get('position/:position')

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

@@ -37,7 +37,7 @@ export class PaymentController {
     const pricing = await this.pricingService.getConfig()
     const planCfg = pricing.plans[plan === 'sprint' ? 'sprint' : 'growth']
     const amount = planCfg.price
-    const title = plan === 'sprint' ? '职引冲刺版月度会员' : '职引成长版月度会员'
+    const title = plan === 'sprint' ? '宇之然AI磁场冲刺版月度会员' : '宇之然AI磁场成长版月度会员'
     const outTradeNo = `${plan === 'sprint' ? 'SPR' : 'VIP'}${Date.now()}${userId.slice(-6)}`
     const result = await this.wechatPay.nativePay(title, outTradeNo, amount)
 
@@ -106,7 +106,7 @@ export class PaymentController {
     this.logger.log(`[jsapi] pricing获取成功`)
     const planCfg = pricing.plans[plan === 'sprint' ? 'sprint' : 'growth']
     const amount = planCfg.price
-    const title = plan === 'sprint' ? '职引冲刺版月度会员' : '职引成长版月度会员'
+    const title = plan === 'sprint' ? '宇之然AI磁场冲刺版月度会员' : '宇之然AI磁场成长版月度会员'
     const outTradeNo = `${plan === 'sprint' ? 'SPR' : 'VIP'}${Date.now()}${userId.slice(-6)}`
     this.logger.log(`[jsapi] 准备调用微信: outTradeNo=${outTradeNo}, amount=${amount}, openid=${openid}`)
     let result: any

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

@@ -74,7 +74,7 @@ export class ResumePdfService {
   <h1>${this.escapeHtml(params.title)}</h1>
   <div class="subtitle">${params.targetPosition ? `目标岗位: ${this.escapeHtml(params.targetPosition)}` : ''}</div>
   <div class="content">${contentHtml}</div>
-  <div class="footer">由 AI磁场·职引 生成</div>
+  <div class="footer">由 AI磁场·宇之然AI磁场 生成</div>
 </div>
 </body>
 </html>`

backend/src/modules/schemas/daily-question.schema.ts

@@ -3,7 +3,7 @@ import { Document } from 'mongoose'
 
 export type DailyQuestionDocument = DailyQuestion & Document
 
-@Schema({ timestamps: true })
+@Schema({ timestamps: true, collection: 'dailyquestions' })
 export class DailyQuestion {
   @Prop({ required: true })
   position: string       // 适用岗位

backend/src/modules/share/share.service.ts

@@ -27,7 +27,7 @@ export class ShareService {
       shareCode,
       type: body.type || 'app',
       refId: body.refId || '',
-      title: body.title || '我在职引发现了好东西',
+      title: body.title || '我在宇之然AI磁场发现了好东西',
       description: body.description || '快来一起体验吧',
     })
     return {