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/build.gradle

@@ -0,0 +1,26 @@
+// Top-level build file
+buildscript {
+    ext {
+        buildToolsVersion = "35.0.0"
+        minSdkVersion = 24
+        compileSdkVersion = 35
+        targetSdkVersion = 35
+        kotlinVersion = "2.0.21"
+    }
+    repositories {
+        google()
+        mavenCentral()
+    }
+    dependencies {
+        classpath("com.android.tools.build:gradle:8.7.3")
+        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:${kotlinVersion}")
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        mavenCentral()
+        maven { url 'https://www.jitpack.io' }
+    }
+}