feat: implement backend API for event management (task 13)

- Create eventController with CRUD operations and registration endpoints
- Implement eventService with Prisma database operations
- Add event routes with authentication middleware
- Support event creation, listing, filtering, registration/unregistration
- Include spatial data handling for event locations
- Add participant count tracking and registration status checks
- Requirements: 4.1, 4.2, 4.3, 4.4

server/src/routes/eventRoutes.ts

@@ -0,0 +1,20 @@
+import { Router } from 'express';
+import { eventController } from '../controllers/eventController';
+import { requireAuth } from '../middleware/auth';
+
+const router = Router();
+
+// Public routes
+router.get('/', eventController.getEvents);
+router.get('/:id', eventController.getEvent);
+router.get('/:id/registrations', eventController.getEventRegistrations);
+
+// Protected routes (require authentication)
+router.post('/', requireAuth, eventController.createEvent);
+router.patch('/:id', requireAuth, eventController.updateEvent);
+router.delete('/:id', requireAuth, eventController.deleteEvent);
+router.post('/:id/register', requireAuth, eventController.registerForEvent);
+router.delete('/:id/register', requireAuth, eventController.unregisterFromEvent);
+router.get('/:id/registration-status', requireAuth, eventController.getRegistrationStatus);
+
+export default router;