feat: expo-updates热更新完整实现 — Metro bundle嵌入APK

- @react-native/metro-config metro配置(代替expo/ExpoMetroConfig)
- index.js纯JS入口(避免TS编译依赖)
- metro.config.js: getDefaultConfig+mergeConfig
- bundle: npx react-native bundle → 879KB JS嵌入APK
- BUILD SUCCESSFUL 387tasks + APK已安装验证
- 屏幕输出: Yuzu GCA / v0.1.0 / expo-updates active

packages/client-android/android/.gradle/buildOutputCleanup/cache.properties

@@ -1,2 +1,2 @@
-#Mon Jul 20 19:51:16 CST 2026
+#Mon Jul 20 23:15:14 CST 2026
 gradle.version=8.10.2