feat(android): OTA双轨更新 — shared版本号+Android Expo/PackageInstaller

- packages/shared: 版本号解析 vX.Y.Z-dav-{client}-{build} + manifest远程检查
- packages/client-android: Expo52 + expo-updates JS bundle OTA
- PackageInstallerModule.kt: APK静默安装原生模块（~60行Kotlin）
- monorepo: pnpm workspace + 版本号体系

packages/client-android/app.json

@@ -0,0 +1,42 @@
+{
+  "expo": {
+    "name": "YuzuGCA",
+    "slug": "yuzu-gca",
+    "version": "0.1.0",
+    "orientation": "portrait",
+    "icon": "./assets/icon.png",
+    "userInterfaceStyle": "dark",
+    "newArchEnabled": true,
+    "splash": {
+      "backgroundColor": "#0f172a"
+    },
+    "ios": {
+      "supportsTablet": false,
+      "bundleIdentifier": "dev.yuzu.gca"
+    },
+    "android": {
+      "adaptiveIcon": {
+        "backgroundColor": "#0f172a"
+      },
+      "package": "dev.yuzu.gca",
+      "allowBackup": false,
+      "permissions": [
+        "REQUEST_INSTALL_PACKAGES"
+      ]
+    },
+    "plugins": [
+      "expo-updates"
+    ],
+    "updates": {
+      "enabled": true,
+      "checkAutomatically": "ON_LOAD",
+      "fallbackToCacheTimeout": 0,
+      "url": "https://git.childish-ghost.com/LukeMackin/Yuzu-GCA/releases/download/manifest/expo-manifest.json"
+    },
+    "extra": {
+      "eas": {
+        "projectId": "yuzu-gca-android"
+      }
+    }
+  }
+}