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

zhiyin-app/src/pages.json

@@ -1,6 +1,6 @@
 {
   "pages": [
-    { "path": "pages/index/index", "style": { "navigationBarTitleText": "AI模拟面试 - 职引" } },
+    { "path": "pages/index/index", "style": { "navigationBarTitleText": "AI模拟面试" } },
     { "path": "pages/interview/interview", "style": { "navigationBarTitleText": "AI模拟面试练习" } },
     { "path": "pages/report/report", "style": { "navigationBarTitleText": "面试报告与评分" } },
     { "path": "pages/member/member", "style": { "navigationBarTitleText": "引力值购买" } },
@@ -12,7 +12,7 @@
     { "path": "pages/user/user", "style": { "navigationBarTitleText": "个人中心" } },
     { "path": "pages/resume/resume", "style": { "navigationBarTitleText": "简历诊断与优化" } },
     { "path": "pages/internship/internship", "style": { "navigationBarTitleText": "热门岗位" } },
-    { "path": "pages/about/about", "style": { "navigationBarTitleText": "关于职引" } },
+    { "path": "pages/about/about", "style": { "navigationBarTitleText": "关于宇之然AI磁场" } },
     { "path": "pages/admin/admin", "style": { "navigationBarTitleText": "管理后台" } },
     { "path": "pages/result/result", "style": { "navigationBarTitleText": "优化结果" } },
     { "path": "pages/agreement/agreement", "style": { "navigationBarTitleText": "用户协议" } },
@@ -35,7 +35,7 @@
   },
   "globalStyle": {
     "navigationBarTextStyle": "black",
-    "navigationBarTitleText": "职引 - AI模拟面试",
+    "navigationBarTitleText": "宇之然AI磁场 - AI模拟面试",
     "navigationBarBackgroundColor": "#ffffff",
     "backgroundColor": "#f5f6f7"
   }