fix: 移动vercel.json

Author: longsizhuo

frontend/vercel.json

@@ -0,0 +1,6 @@
+{
+  "$schema": "https://openapi.vercel.sh/vercel.json",
+  "framework": "nextjs",
+  "installCommand": "pnpm install",
+  "buildCommand": "pnpm run build"
+}