feat(tournament): implement class merging and pool management features

- Added mergeClassesIntoPool and resetPool functions in tournamentService to handle merging classes into a common pool and resetting pool assignments.
- Introduced new API routes for merging and resetting pools in tournamentRoutes.
- Enhanced TournamentGroupsTab component with UI for merging classes, including selection for source and target classes, strategy options, and out-of-competition settings.
- Updated localization files to include new strings related to class merging functionality.
- Modified TournamentTab to handle merge pool events and manage API interactions for merging classes.

backend/routes/tournamentRoutes.js

@@ -40,6 +40,7 @@ import {
   updatePairing,
   deletePairing,
 } from '../controllers/tournamentController.js';
+import { mergeClassesIntoPool, resetPool } from '../controllers/tournamentController.js';
 import {
   getStages,
   upsertStages,
@@ -60,6 +61,9 @@ router.put('/groups', authenticate, createGroups);
 router.post('/groups/create', authenticate, createGroupsPerClass);
 router.post('/groups', authenticate, fillGroups);
 router.post('/matches/create', authenticate, createGroupMatches);
+// Pools
+router.post('/pools/merge', authenticate, mergeClassesIntoPool);
+router.post('/pools/reset', authenticate, resetPool);
 router.get('/groups', authenticate, getGroups);
 router.post('/match/result', authenticate, addMatchResult);
 router.delete('/match/result', authenticate, deleteMatchResult);