Sửa lỗi tái cấu trúc thư mục và khai báo import

package.json

@@ -1,57 +1,20 @@
 {
-  "name": "travel-planning-backend",
+  "name": "travel-planning-monorepo",
   "version": "1.0.0",
-  "description": "Travel Planning Backend with NestJS and Prisma 7",
+  "private": true,
   "type": "module",
+  "workspaces": [
+    "backend",
+    "frontend"
+  ],
   "scripts": {
-    "build": "nest build",
-    "start": "nest start",
-    "start:dev": "nest start --watch",
-    "frontend": "vite",
-    "db:migrate": "npx prisma migrate dev",
-    "db:generate": "npx prisma generate",
-    "db:seed": "npx tsx seed.ts"
-  },
-  "dependencies": {
-    "@nestjs/common": "^11.1.26",
-    "@nestjs/core": "^11.1.26",
-    "@nestjs/jwt": "^11.0.2",
-    "@nestjs/passport": "^11.0.5",
-    "@nestjs/platform-express": "^11.1.26",
-    "@prisma/adapter-pg": "^7.8.0",
-    "@prisma/client": "^7.8.0",
-    "bcrypt": "^5.1.1",
-    "date-fns": "^2.30.0",
-    "dotenv": "^16.3.0",
-    "leaflet": "^1.9.4",
-    "lucide-react": "^0.284.0",
-    "passport": "^0.7.0",
-    "passport-jwt": "^4.0.1",
-    "pg": "^8.11.0",
-    "react": "^18.3.1",
-    "react-dom": "^18.3.1",
-    "react-leaflet": "^4.2.1",
-    "react-leaflet-cluster": "^2.1.0",
-    "reflect-metadata": "^0.1.13",
-    "rxjs": "^7.8.1",
-    "zustand": "^5.0.1"
+    "build": "npm run build --workspace=backend && npm run build --workspace=frontend",
+    "start:dev": "concurrently \"npm run start:dev --workspace=backend\" \"npm run dev --workspace=frontend\"",
+    "db:migrate": "npm run db:migrate --workspace=backend",
+    "db:generate": "npm run db:generate --workspace=backend",
+    "db:seed": "npm run db:seed --workspace=backend"
   },
   "devDependencies": {
-    "@nestjs/cli": "^10.0.0",
-    "@tailwindcss/postcss": "^4.3.1",
-    "@types/bcrypt": "^5.0.2",
-    "@types/leaflet": "^1.9.12",
-    "@types/node": "^20.0.0",
-    "@types/passport-jwt": "^4.0.1",
-    "@types/pg": "^8.10.0",
-    "@types/react": "^18.3.12",
-    "@vitejs/plugin-react": "^6.0.2",
-    "autoprefixer": "^10.5.0",
-    "postcss": "^8.5.15",
-    "prisma": "^7.8.0",
-    "tailwindcss": "^4.3.1",
-    "tsx": "^4.0.0",
-    "typescript": "^5.7.0",
-    "vite": "^8.0.16"
+    "concurrently": "^8.2.2"
   }
 }