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/modules/package-installer/android/src/main/java/dev/yuzu/gca/PackageInstallerModule.kt

@@ -0,0 +1,55 @@
+package dev.yuzu.gca
+
+import android.app.PendingIntent
+import android.content.Context
+import android.content.Intent
+import android.content.pm.PackageInstaller
+import expo.modules.kotlin.modules.Module
+import expo.modules.kotlin.modules.ModuleDefinition
+import java.io.File
+import java.io.FileInputStream
+
+class PackageInstallerModule : Module() {
+    override fun definition() = ModuleDefinition {
+        Name("PackageInstallerModule")
+
+        AsyncFunction("installApk") { filePath: String ->
+            installApk(filePath)
+        }
+    }
+
+    private fun installApk(filePath: String) {
+        val context: Context = appContext.reactContext ?: return
+        val apkFile = File(filePath)
+        if (!apkFile.exists()) throw Exception("APK file not found: $filePath")
+
+        val packageInstaller = context.packageManager.packageInstaller
+        val sessionParams = PackageInstaller.SessionParams(
+            PackageInstaller.SessionParams.MODE_FULL_INSTALL
+        )
+
+        val sessionId = packageInstaller.createSession(sessionParams)
+        val session = packageInstaller.openSession(sessionId)
+
+        try {
+            FileInputStream(apkFile).use { input ->
+                session.openWrite("package", 0, apkFile.length()).use { output ->
+                    input.copyTo(output)
+                }
+                session.fsync(output)
+            }
+
+            // 安装完成后发送通知，用户点击即重启
+            val intent = Intent(context, context.javaClass)
+            intent.action = Intent.ACTION_MAIN
+            val pendingIntent = PendingIntent.getActivity(
+                context, 0, intent,
+                PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE
+            )
+
+            session.commit(pendingIntent.intentSender)
+        } finally {
+            session.close()
+        }
+    }
+}

packages/client-android/modules/package-installer/expo-module.config.json

@@ -0,0 +1,4 @@
+{
+  "platform": "android",
+  "modules": ["PackageInstallerModule"]
+}