refactor: migrate to nextjs serverless handler for vercel

package.json

@@ -4,8 +4,9 @@
   "description": "",
   "main": "index.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1",
-    "start": "node index.js"    
+    "dev": "next dev",
+    "build": "next build",
+    "start": "next start"
   },
   "keywords": [],
   "author": "",
@@ -13,9 +14,13 @@
   "type": "commonjs",
   "dependencies": {
     "@apollo/server": "^5.5.1",
+    "@as-integrations/next": "^4.1.0",
     "cors": "^2.8.6",
     "dotenv": "^17.4.2",
     "graphql": "^16.14.2",
-    "pg": "^8.23.0"
+    "next": "^16.3.4",
+    "pg": "^8.23.0",
+    "react": "^19.2.8",
+    "react-dom": "^19.2.8"
   }
 }