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>

package.json

@@ -17,13 +17,16 @@
     "@mui/material": "^7.3.6",
     "@mui/x-data-grid": "^8.21.0",
     "@tailwindcss/vite": "^4.1.18",
+    "leaflet": "^1.9.4",
     "lucide-react": "^0.559.0",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
+    "react-leaflet": "^4.2.1",
     "recharts": "^3.6.0",
     "tailwindcss": "^4.1.18"
   },
   "devDependencies": {
+    "@types/leaflet": "^1.9.21",
     "@types/react": "^18.2.66",
     "@types/react-dom": "^18.2.22",
     "@typescript-eslint/eslint-plugin": "^7.2.0",