- Updated relative imports by replacing `@/` aliases with proper `../` paths for consistency.
- Refined type definitions in IPC handlers and repositories (`User`, `Chapter`, `Act`, etc.).
- Simplified return types in `Location` model methods for streamlined usage.
- Add JSDoc comments for better maintainability and code clarity in `BookRepo` methods.
- Streamline query definitions using variables to improve readability.
- Consolidate error handling logic across all methods.
- Ensure multilingual support in error messages for consistent user feedback.
- Remove redundant error branches and simplify unknown error processing.
- Deleted unused database table interfaces and repository methods for book acts, chapters, characters, locations, worlds, and related entities.
- Reduced code complexity by consolidating remaining logic under streamlined methods in `BookRepo`.
- Improved maintainability by cleaning up outdated query interfaces and redundant synchronization code.
