- Renamed XML mapper files for consistency.
- Added new fields `is_admin` and `is_banned` to the `Reader` entity and updated the database schema.
- Introduced `AuthCheck` annotation for method-level authorization.
- Implemented JWT utility for token generation and validation.
- Enhanced service and controller layers for `Book`, `Reader`, and `Orders` with new methods and improved error handling.
- Added global exception handling for better API response management.
- Updated `pom.xml` to include new dependencies for JWT and Spring Security.
