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

package.json

@@ -0,0 +1,10 @@
+{
+  "name": "yuzu-gca",
+  "private": true,
+  "version": "0.1.0",
+  "description": "Global Control Assistant — 全局控制助手",
+  "scripts": {
+    "android": "pnpm --filter @yuzu-gca/client-android start",
+    "build:android": "pnpm --filter @yuzu-gca/client-android build"
+  }
+}