- Internal Frontend will now show users when they are already whitelisted

Changed
- Refactored UUID handling in the API request handler to improve clarity and maintainability.

Fixed
- Users can no longer end up on the requests list if they are already on the whitelist

Added
- Added the whitelist check to return appropriate messages if the user is already on the whitelist. (API)

Changed:
- Replaced console command for whitelisting with direct API calls to improve performance and reduce overhead
- Optimized whitelist logic with fallback to UUID if username fails

Fixed:
- Improved error handling for failed whitelist attempts, now provides proper console feedback

Support added for:
1.20.5
1.20.6
1.21.1