Implement tournament pairing functionality and enhance participant management

- Introduced new endpoints for managing tournament pairings, including creating, updating, and deleting pairings.
- Updated the tournament service to handle pairing logic, ensuring validation for participants and preventing duplicate pairings.
- Enhanced participant management by adding class-based checks for gender and age restrictions when adding participants.
- Updated the tournament controller and routes to support the new pairing features and improved participant handling.
- Added localization support for new UI elements related to pairings in the frontend, enhancing user experience.

backend/routes/tournamentRoutes.js

@@ -34,6 +34,10 @@ import {
   updateParticipantClass,
   createGroupsPerClass,
   assignParticipantToGroup,
+  getPairings,
+  createPairing,
+  updatePairing,
+  deletePairing,
 } from '../controllers/tournamentController.js';
 import { authenticate } from '../middleware/authMiddleware.js';
 
@@ -78,4 +82,10 @@ router.put('/class/:clubId/:tournamentId/:classId', authenticate, updateTourname
 router.delete('/class/:clubId/:tournamentId/:classId', authenticate, deleteTournamentClass);
 router.put('/participant/:clubId/:tournamentId/:participantId/class', authenticate, updateParticipantClass);
 
+// Tournament Pairings
+router.get('/pairings/:clubId/:tournamentId/:classId', authenticate, getPairings);
+router.post('/pairing/:clubId/:tournamentId/:classId', authenticate, createPairing);
+router.put('/pairing/:clubId/:tournamentId/:pairingId', authenticate, updatePairing);
+router.delete('/pairing/:clubId/:tournamentId/:pairingId', authenticate, deletePairing);
+
 export default router;