feat(tournament): add cleanup logic for orphaned matches

- Implemented a new method to clean up orphaned matches where at least one player no longer exists, enhancing data integrity in tournament management.
- Added a corresponding route and frontend functionality to trigger the cleanup process, allowing users to easily remove invalid match records.
- Updated localization strings to support the new feature, ensuring clarity in the user interface.

backend/routes/tournamentRoutes.js

@@ -19,6 +19,7 @@ import {
   manualAssignGroups,
   resetGroups,
   resetMatches,
+  cleanupOrphanedMatches,
   removeParticipant,
   updateParticipantSeeded,
   setParticipantGaveUp,
@@ -61,6 +62,7 @@ router.put('/participant/:clubId/:tournamentId/:participantId/gave-up', authenti
 router.post('/modus', authenticate, setModus);
 router.post('/groups/reset', authenticate, resetGroups);
 router.post('/matches/reset', authenticate, resetMatches);
+router.post('/matches/cleanup-orphaned', authenticate, cleanupOrphanedMatches);
 router.put('/groups', authenticate, createGroups);
 router.post('/groups/create', authenticate, createGroupsPerClass);
 router.post('/groups', authenticate, fillGroups);