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/App.tsx

@@ -0,0 +1,72 @@
+import { StatusBar } from 'expo-status-bar';
+import { useEffect, useState } from 'react';
+import { StyleSheet, Text, View, ActivityIndicator } from 'react-native';
+import { onAppStartCheckUpdate } from './src/updater/index';
+
+export default function App() {
+  const [status, setStatus] = useState<'checking' | 'up-to-date' | 'updating' | 'error'>('checking');
+  const [message, setMessage] = useState('正在检查更新...');
+
+  useEffect(() => {
+    (async () => {
+      try {
+        const result = await onAppStartCheckUpdate();
+        if (result.jsUpdate) {
+          setStatus('updating');
+          setMessage('发现 JS 更新，正在下载...（下次启动生效）');
+        } else if (result.apkUpdate) {
+          setStatus('updating');
+          setMessage('安装包已就绪，重启后生效');
+        } else {
+          setStatus('up-to-date');
+          setMessage('已是最新版本');
+        }
+      } catch (e: any) {
+        setStatus('error');
+        setMessage(`更新检查失败: ${e.message}`);
+      }
+    })();
+  }, []);
+
+  return (
+    <View style={styles.container}>
+      <StatusBar style="light" />
+      <Text style={styles.title}>Yuzu GCA</Text>
+      <Text style={styles.subtitle}>Global Control Assistant</Text>
+      <View style={styles.statusBar}>
+        {status === 'checking' && <ActivityIndicator color="#3b82f6" />}
+        <Text style={styles.statusText}>{message}</Text>
+      </View>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    backgroundColor: '#0f172a',
+    alignItems: 'center',
+    justifyContent: 'center',
+    padding: 24,
+  },
+  title: {
+    fontSize: 28,
+    fontWeight: '800',
+    color: '#e2e8f0',
+    marginBottom: 4,
+  },
+  subtitle: {
+    fontSize: 14,
+    color: '#94a3b8',
+    marginBottom: 32,
+  },
+  statusBar: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    gap: 8,
+  },
+  statusText: {
+    fontSize: 14,
+    color: '#94a3b8',
+  },
+});