chore: fixed postinstall script in packages/nuxt

Author: hunterliu1003

packages/nuxt/package.json

@@ -21,7 +21,7 @@
     "dev:build": "nuxi build playground",
     "dev:prepare": "nuxt-module-build --stub && nuxi prepare playground",
     "release": "pnpm prepack && release-it",
-    "postinstall": "pnpm prepack"
+    "postinstall": "pnpm dev:prepare && pnpm prepack"
   },
   "dependencies": {
     "@nuxt/kit": "^3.0.0-rc.12",