add:添加命令同时运行前后端

package.json

@@ -4,6 +4,7 @@
   "version": "0.0.0",
   "type": "module",
   "scripts": {
+    "start:dev": "concurrently \"npm run dev\" \"cd backend && npm run start\"",
     "dev": "vite",
     "build": "vue-tsc -b && vite build",
     "preview": "vite preview",
@@ -27,6 +28,7 @@
     "@arco-design/web-vue": "^2.56.0",
     "@types/node": "^22.9.0",
     "@vitejs/plugin-vue": "^5.0.5",
+    "concurrently": "^9.1.0",
     "less": "^4.2.0",
     "rollup-plugin-visualizer": "^5.12.0",
     "sass": "^1.77.8",