- Introduced `check_ban` and `get_ban_reason` functions in `db::users`
- Updated client handler to enforce ban checks during login
- Added detailed logging for ban status and reasons
Add user authentication with password hashing
- Integrated Argon2 for password hashing and verification
- Added bcrypt and thiserror dependencies
- Updated database schema with admin and ban flags
- Implemented user account creation and login logic
- Enhanced error handling for database operations
```
