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。

package.json

@@ -12,7 +12,6 @@
     "build": "pnpm run convert && pnpm -C apps/web run generate && tsx scripts/copy-web-output.ts",
     "build:full": "pnpm run build",
     "build:nuxt": "pnpm -C apps/web run build",
-    "build:android": "bash ./scripts/android/build.sh",
     "convert": "pnpm -C packages/cook run convert",
     "validate": "tsx scripts/validate-recipes.ts",
     "check:videos": "tsx scripts/check-video-links.ts",
@@ -21,13 +20,6 @@
     "fixtures": "tsx scripts/gen-fixtures.ts",
     "dev": "pnpm -C apps/web run dev",
     "dev:pwa": "pnpm -C apps/web run dev:pwa",
-    "dev:android": "bash ./scripts/android/dev.sh",
-    "bash:ios": "bash ./scripts/ios.sh",
-    "dev:ios": "cap run ios -l",
-    "ios": "cap run ios",
-    "android": "cap run android",
-    "open:ios": "cap open ios",
-    "open:android": "cap open android",
     "docs:dev": "pnpm -C docs run docs:dev",
     "docs:build": "pnpm -C docs run docs:build",
     "generate": "pnpm -C apps/web run generate && tsx scripts/copy-web-output.ts",
@@ -36,27 +28,13 @@
     "lint": "eslint .",
     "preview": "pnpm -C apps/web run preview",
     "release": "bumpp",
-    "sync": "cap sync",
     "test": "vitest",
     "test:coverage": "vitest run --coverage",
     "typecheck": "pnpm -C packages/cook run build && pnpm -C apps/web run typecheck",
     "pack:skill": "tsx scripts/pack-skill.ts"
   },
-  "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/ios": "8.5.0",
-    "@capacitor/keyboard": "8.0.5",
-    "@capacitor/preferences": "8.0.1",
-    "@capacitor/status-bar": "8.0.3"
-  },
   "devDependencies": {
     "@antfu/eslint-config": "^8.3.0",
-    "@capacitor/android": "8.5.0",
-    "@capacitor/cli": "8.5.0",
     "@types/node": "^25.9.5",
     "@unocss/eslint-config": "^66.7.5",
     "@vue/test-utils": "^2.4.11",