feat(database): add database service abstraction with libsql/turso backend (#3472)

apps/readest-app/src/services/webAppService.ts

@@ -1,4 +1,5 @@
 import { FileSystem, BaseDir, AppPlatform, ResolvedPath, FileItem } from '@/types/system';
+import { DatabaseService } from '@/types/database';
 import { getOSPlatform, isValidURL } from '@/utils/misc';
 import { RemoteFile } from '@/utils/file';
 import { isPWA } from './environment';
@@ -347,4 +348,10 @@ export class WebAppService extends BaseAppService {
   async ask(message: string): Promise<boolean> {
     return window.confirm(message);
   }
+
+  async openDatabase(path: string, base: BaseDir): Promise<DatabaseService> {
+    const fullPath = await this.resolveFilePath(path, base);
+    const { WebDatabaseService } = await import('./database/webDatabaseService');
+    return WebDatabaseService.open(fullPath);
+  }
 }