refactor: 个人自用，移除登录与云同步全链路

站点只给本人用，云乐坊 SSO 授权、收藏/历史云同步、获客归因和账号切换记账都没有收益，却被登录状态检查和同步失败提示持续打扰。

- 删除 useYunlefunAuth / yunlefunAuth / yunlefunSsoConfig / yunlefunAuth 适配器、useUserDataSync / userDataSync / userData 适配器、三个 client 插件与 /auth/callback 回调页
- 抽出 adapters/cloudbase.ts，让「反馈一下」和匿名筛选信号不再依赖登录态；cook-feedback 云函数保留
- 删除 cook-user-data 云函数与 cook_user_data 权限规则，移除 @yunlefun/sso 依赖
- 「我的」页删掉登录按钮、账号卡、四个统计格和退出登录；「关于」页删掉项目作者、致谢名单和上游宣传链接
- 本地收藏/历史与导出导入保留，删除同步专用的 lastUid 记账

取舍见 docs/decisions/0005-drop-login-and-sync.md

apps/web/nuxt.config.ts

@@ -118,16 +118,8 @@ export default defineNuxtConfig({
     public: {
       clarityProjectId: process.env.NUXT_PUBLIC_CLARITY_PROJECT_ID ?? 'ks1ebw03i5',
       clarityDomains: process.env.NUXT_PUBLIC_CLARITY_DOMAINS ?? 'cook.yunyoujun.cn,cook.yunle.fun',
+      // CloudBase 环境，用于「反馈一下」和匿名筛选信号；不涉及任何账号体系。
       yunlefunCloudbaseEnv: process.env.NUXT_PUBLIC_YUNLEFUN_CLOUDBASE_ENV || 'yunlefun-8g7ybcxc7345c490',
-      yunlefunSsoClientId: process.env.NUXT_PUBLIC_YUNLEFUN_SSO_CLIENT_ID || 'cook-web',
-      yunlefunSsoExchangeUrl: process.env.NUXT_PUBLIC_YUNLEFUN_SSO_EXCHANGE_URL || 'https://api.yunle.fun/sso-ticket',
-      yunlefunSsoOrigin: process.env.NUXT_PUBLIC_YUNLEFUN_SSO_ORIGIN || 'https://www.yunle.fun',
-      yunlefunSsoRedirectUri: process.env.NUXT_PUBLIC_YUNLEFUN_SSO_REDIRECT_URI || 'https://cook.yunyoujun.cn/auth/callback',
-      yunlefunSsoRedirectUris: process.env.NUXT_PUBLIC_YUNLEFUN_SSO_REDIRECT_URIS || [
-        process.env.NUXT_PUBLIC_YUNLEFUN_SSO_REDIRECT_URI || 'https://cook.yunyoujun.cn/auth/callback',
-        'https://cook.yunle.fun/auth/callback',
-      ].join(','),
-      yunlefunSsoScope: process.env.NUXT_PUBLIC_YUNLEFUN_SSO_SCOPE || 'identity:bootstrap',
     },
   },
 
@@ -159,7 +151,7 @@ export default defineNuxtConfig({
     },
     prerender: {
       crawlLinks: false,
-      routes: ['/', '/random', '/help', '/user', '/404', '/settings', '/auth/callback'],
+      routes: ['/', '/random', '/help', '/user', '/404', '/settings'],
       ignore: ['/hi'],
     },
   },