Add multi-language support and new repository methods for book synchronization

- Extend repository methods to handle API requests for fetching books, chapters, characters, and other entities with multilingual support (`lang: 'fr' | 'en'`).
- Add `uploadBookForSync` logic to consolidate and decrypt book data for synchronization.
- Refactor schema migration logic to remove console logs and streamline table recreation.
- Enhance error handling across database repositories and IPC methods.

electron/database/database.service.ts

@@ -34,14 +34,10 @@ export class DatabaseService {
         this.db = new sqlite3.Database(dbPath);
         this.userEncryptionKey = encryptionKey;
         this.userId = userId;
-
-        // Initialize schema (creates tables if they don't exist)
+        
         initializeSchema(this.db);
-
-        // Run migrations (updates existing tables if needed)
+        
         runMigrations(this.db);
-
-        console.log(`Database initialized for user ${userId} at ${dbPath}`);
     }
 
     /**