add eslint and prettier

backend/package.json

@@ -7,7 +7,8 @@
   "type": "module",
   "main": "src/index.js",
   "scripts": {
-    "start": "nodemon --watch src/ node src/init.js"
+    "start": "nodemon --watch src/ node src/init.js",
+    "prepare": "husky"
   },
   "dependencies": {
     "cors": "^2.8.5",
@@ -20,6 +21,19 @@
     "swagger-ui-express": "^5.0.1"
   },
   "devDependencies": {
-    "nodemon": "^3.1.10"
+    "@eslint/js": "^9.35.0",
+    "eslint": "^9.35.0",
+    "globals": "^16.4.0",
+    "husky": "^9.1.7",
+    "lint-staged": "^16.1.6",
+    "nodemon": "^3.1.10",
+    "prettier": "^3.6.2"
+  },
+  "lint-staged": {
+    "*.js": [
+      "prettier --write",
+      "eslint --fix",
+      "git add"
+    ]
   }
 }