feat: add new server entry point and update package.json

package.json

@@ -1,16 +1,35 @@
 {
   "name": "accountbook",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "description": "简易记账本",
-  "main": "server.js",
+  "main": "server/index.js",
   "scripts": {
-    "start": "node server.js"
+    "start": "node server/index.js",
+    "dev": "concurrently \"npm run server:dev\" \"npm run client:dev\"",
+    "server:dev": "node server/index.js",
+    "client:dev": "cd frontend && npm run dev",
+    "build": "cd frontend && npm run build",
+    "migrate": "node server/db/migrate.js",
+    "test": "jest",
+    "lint": "eslint server/ frontend/",
+    "lint:fix": "eslint server/ frontend/ --fix"
   },
   "dependencies": {
     "express": "^4.18.2",
     "better-sqlite3": "^9.2.2",
     "jsonwebtoken": "^9.0.2",
     "bcryptjs": "^2.4.3",
-    "cors": "^2.8.5"
+    "cors": "^2.8.5",
+    "dotenv": "^16.3.1"
+  },
+  "devDependencies": {
+    "concurrently": "^8.2.2",
+    "eslint": "^8.55.0",
+    "jest": "^29.7.0",
+    "nodemon": "^3.0.2",
+    "prettier": "^3.1.0",
+    "eslint-config-prettier": "^9.1.0",
+    "eslint-plugin-node": "^11.1.0",
+    "supertest": "^6.3.3"
   }
 }