chore: add Vercel dependencies

Author: minai621

package.json

@@ -20,6 +20,7 @@
     "tsx": "^4.20.3",
     "typescript": "^5.8.3",
     "typescript-eslint": "^8.4.0",
+    "vercel": "^44.5.5",
     "vitest": "^3.2.4"
   },
   "engines": {