refactor(stores): unify data sources pattern and extract BaseManager base class

- Add BaseManager/CachedManager base classes to eliminate duplicate cache logic
- Add postListSources.ts with IPostListPagedSource interface
- Add groupListSources.ts with IGroupListPagedSource interface
- Refactor postManager to use CachedManager and Sources pattern
- Refactor groupManager to use CachedManager and Sources pattern
- Clean up duplicate methods in groupService.ts
- Fix TypeScript errors and remove mock data

src/services/apkUpdateService.ts

@@ -9,17 +9,10 @@ import AsyncStorage from '@react-native-async-storage/async-storage';
 import { showConfirm } from './dialogService';
 
 // 条件导入原生模块（仅在 Android 上可用）
-let FileSystem: typeof import('expo-file-system/legacy') | null = null;
-let IntentLauncher: typeof import('expo-intent-launcher') | null = null;
-
-if (Platform.OS === 'android') {
-  try {
-    FileSystem = require('expo-file-system/legacy');
-    IntentLauncher = require('expo-intent-launcher');
-  } catch (e) {
-    console.warn('Failed to load native modules for APK update:', e);
-  }
-}
+// eslint-disable-next-line @typescript-eslint/no-var-requires
+const FileSystem = Platform.OS === 'android' ? require('expo-file-system/legacy') : null;
+// eslint-disable-next-line @typescript-eslint/no-var-requires
+const IntentLauncher = Platform.OS === 'android' ? require('expo-intent-launcher') : null;
 
 // 更新服务器地址
 const UPDATES_SERVER_URL = Constants.expoConfig?.extra?.updatesUrl