- Implement `CharacterRepo`, `LocationRepo`, and `UserRepo` for managing character, location, and user data with SQLite.
- Add methods for performing CRUD operations on characters, locations, and users, including attributes and metadata handling.
- Integrate error handling with multilingual support (`fr` and `en`).
- Support data encryption and synchronization using the existing database utilities.
- Implement `schema.ts` for SQLite schema creation, indexing, and sync metadata initialization.
- Develop `encryption.ts` with AES-256-GCM encryption utilities for securing database data.
- Add `database.service.ts` to manage CRUD operations with encryption support, user-specific databases, and schema initialization.
- Integrate book, chapter, and character operations with encrypted content handling and sync preparation.
