Simplify Vercel config to resolve API routing issues

vercel.json

@@ -1,47 +1,3 @@
 {
-  "framework": "nextjs",
-  "buildCommand": "npm run build",
-  "outputDirectory": ".next",
-  "installCommand": "npm install",
-  "headers": [
-    {
-      "source": "/static/(.*)",
-      "headers": [
-        {
-          "key": "Cache-Control",
-          "value": "public, max-age=31536000, immutable"
-        }
-      ]
-    },
-    {
-      "source": "/api/(.*)",
-      "headers": [
-        {
-          "key": "Access-Control-Allow-Origin",
-          "value": "*"
-        },
-        {
-          "key": "Access-Control-Allow-Methods", 
-          "value": "GET, POST, PUT, DELETE, OPTIONS"
-        },
-        {
-          "key": "Access-Control-Allow-Headers",
-          "value": "Content-Type, Authorization"
-        }
-      ]
-    },
-    {
-      "source": "/(.*)",
-      "headers": [
-        {
-          "key": "X-Frame-Options",
-          "value": "DENY"
-        },
-        {
-          "key": "X-Content-Type-Options",
-          "value": "nosniff"
-        }
-      ]
-    }
-  ]
+  "framework": "nextjs"
 }