Add @types/react-router-dom for TypeScript compilation

frontend/package.json

@@ -15,6 +15,7 @@
     "axios": "^1.6.0",
     "@types/react": "^18.2.43",
     "@types/react-dom": "^18.2.17",
+    "@types/react-router-dom": "^6.5.0",
     "@vitejs/plugin-react": "^4.2.1",
     "typescript": "^5.3.3",
     "vite": "^5.0.8"