Update training group management and enhance UI components

This commit introduces the `TrainingGroup` model and related functionality, allowing for the management of training groups within the application. The `ClubService` is updated to automatically create preset groups upon club creation. The frontend is enhanced with new views and components, including `TrainingGroupsView` and `TrainingGroupsTab`, to facilitate the display and management of training groups. Additionally, the `MembersView` is updated to allow adding and removing members from training groups, improving the overall user experience and interactivity in managing club members and their associated training groups.

backend/routes/trainingGroupRoutes.js

@@ -0,0 +1,33 @@
+import express from 'express';
+import { authenticate } from '../middleware/authMiddleware.js';
+import {
+    getTrainingGroups,
+    createTrainingGroup,
+    updateTrainingGroup,
+    deleteTrainingGroup,
+    addMemberToGroup,
+    removeMemberFromGroup,
+    getMemberGroups,
+    ensurePresetGroups,
+    enablePresetGroup,
+} from '../controllers/trainingGroupController.js';
+
+const router = express.Router();
+
+router.use(authenticate);
+
+// Spezifischere Routen zuerst (mit /member/ im Pfad)
+router.get('/:clubId/member/:memberId', getMemberGroups);
+router.post('/:clubId/:groupId/member/:memberId', addMemberToGroup);
+router.delete('/:clubId/:groupId/member/:memberId', removeMemberFromGroup);
+
+// Allgemeinere Routen danach
+router.post('/:clubId/ensure-preset-groups', ensurePresetGroups);
+router.post('/:clubId/enable-preset-group/:presetType', enablePresetGroup);
+router.get('/:clubId', getTrainingGroups);
+router.post('/:clubId', createTrainingGroup);
+router.put('/:clubId/:groupId', updateTrainingGroup);
+router.delete('/:clubId/:groupId', deleteTrainingGroup);
+
+export default router;
+