refactor: 只保留 Web，移除 Capacitor 原生壳

删除 android/、ios/ 两个 Capacitor 原生工程与 capacitor.config.ts、
ionic.config.json，以及 scripts/android、scripts/ios.sh 构建脚本；
根与 apps/web 的 @capacitor/* 依赖和相关 npm scripts 一并移除。

Web 侧去掉原生分支：登录只走云乐坊容器授权面板或顶层重定向，
暗色模式不再改原生状态栏，移除 Android 物理返回键处理。

保留 @nuxtjs/ionic（Web UI 框架）、云乐坊 window.ylf 桥接与 PWA。

决策记录见 docs/decisions/0004-web-only.md。

apps/web/package.json

@@ -13,14 +13,6 @@
     "typecheck": "nuxt typecheck"
   },
   "dependencies": {
-    "@capacitor/app": "8.1.1",
-    "@capacitor/browser": "8.0.4",
-    "@capacitor/core": "8.5.0",
-    "@capacitor/dialog": "8.0.1",
-    "@capacitor/haptics": "8.0.2",
-    "@capacitor/keyboard": "8.0.5",
-    "@capacitor/preferences": "8.0.1",
-    "@capacitor/status-bar": "8.0.3",
     "@cloudbase/js-sdk": "3.7.1",
     "@yunlefun/sso": "0.7.0",
     "@yunyoujun/cook": "workspace:*",