feat(TournamentStats): add internal tournament statistics endpoint and localization updates

- Implemented a new endpoint `getInternalTournamentStats` in the tournament controller to retrieve statistics for internal tournaments based on club ID and selected months.
- Enhanced the tournament service to compute player statistics, including absolute and average rankings.
- Updated tournament routes to include the new statistics endpoint.
- Added localization strings for internal tournament statistics in multiple languages, improving user accessibility and experience.
- Integrated the new statistics component into the TournamentsView for better user interaction.

backend/routes/tournamentRoutes.js

@@ -34,6 +34,7 @@ import {
   updateExternalParticipantSeeded,
   setExternalParticipantGaveUp,
   getTournamentClasses,
+  getInternalTournamentStats,
   addTournamentClass,
   updateTournamentClass,
   deleteTournamentClass,
@@ -55,6 +56,8 @@ import { authenticate } from '../middleware/authMiddleware.js';
 
 const router = express.Router();
 
+router.get('/internal-stats/:clubId', authenticate, getInternalTournamentStats);
+
 router.post('/participant', authenticate, addParticipant);
 router.post('/participants', authenticate, getParticipants);
 router.delete('/participant', authenticate, removeParticipant);