feat(ClubSettings): add country and state code fields for regional calendar data

- Introduced `countryCode` and `stateCode` fields in the Club model to support regional calendar data.
- Updated ClubSettings component to allow users to select their country and state, enhancing the configuration options for clubs.
- Enhanced the ClubService to handle normalization of country and state codes during updates.
- Added new routes and middleware to support the training cancellation feature and calendar integration in the backend.
- Updated frontend navigation to include a calendar link, improving user access to scheduling features.

backend/routes/calendarRoutes.js

@@ -0,0 +1,9 @@
+import express from 'express';
+import { authenticate } from '../middleware/authMiddleware.js';
+import { getClubCalendarDays } from '../controllers/calendarController.js';
+
+const router = express.Router();
+
+router.get('/club/:clubId/holidays', authenticate, getClubCalendarDays);
+
+export default router;

backend/routes/trainingCancellationRoutes.js

@@ -0,0 +1,16 @@
+import express from 'express';
+import { authenticate } from '../middleware/authMiddleware.js';
+import {
+  deleteTrainingCancellation,
+  getTrainingCancellations,
+  upsertTrainingCancellation,
+} from '../controllers/trainingCancellationController.js';
+
+const router = express.Router();
+router.use(authenticate);
+
+router.get('/:clubId', getTrainingCancellations);
+router.post('/:clubId', upsertTrainingCancellation);
+router.delete('/:clubId/:cancellationId', deleteTrainingCancellation);
+
+export default router;