build(android): 生成原生Android工程 — Android Studio直接构建

- android/: 完整Gradle工程(build.gradle/settings/AndroidManifest/Activity/Application)
- PackageInstallerModule: 重写为ReactContextBaseJavaModule (bare RN, 移除Expo依赖)
- 新增sha256File原生方法, installApk改为Promise异步
- 移除旧的modules/ (Expo Module → bare React Native)
- 添加eas.json (备用云端构建)

packages/client-android/android/app/src/main/AndroidManifest.xml

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />
+
+    <application
+        android:name=".MainApplication"
+        android:label="Yuzu GCA"
+        android:icon="@mipmap/ic_launcher"
+        android:allowBackup="false"
+        android:supportsRtl="true"
+        android:usesCleartextTraffic="true">
+
+        <activity
+            android:name=".MainActivity"
+            android:label="Yuzu GCA"
+            android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|screenSize|smallestScreenSize|uiMode"
+            android:launchMode="singleTask"
+            android:windowSoftInputMode="adjustResize"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>