Add Analytics section and improve Connectors pages

- Add Analytics pages: Map (Leaflet), Reports, and Server metrics
- Add Analytics section to sidebar (Admin only)
- Improve SHMetersPage and XMetersPage with real API data
- Add analytics API service for connector stats and server metrics
- Register system routes in backend

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

water-api/src/routes/index.ts

@@ -17,6 +17,7 @@ import csvUploadRoutes from './csv-upload.routes';
 import auditRoutes from './audit.routes';
 import notificationRoutes from './notification.routes';
 import testRoutes from './test.routes';
+import systemRoutes from './system.routes';
 
 // Create main router
 const router = Router();
@@ -188,4 +189,13 @@ router.use('/notifications', notificationRoutes);
  */
 router.use('/test', testRoutes);
 
+/**
+ * System routes (ADMIN only):
+ * - GET /system/metrics - Get server metrics (CPU, memory, requests)
+ * - GET /system/health - Detailed health check
+ * - GET /system/meters-locations - Get meters with coordinates for map
+ * - GET /system/report-stats - Get statistics for reports dashboard
+ */
+router.use('/system', systemRoutes);
+
 export default router;