fix(ci): add prisma generate to postinstall to fix missing generated client in CI

Author: longsizhuo

package.json

@@ -9,7 +9,7 @@
     "start": "next start -p 3000",
     "test": "vitest run",
     "test:watch": "vitest",
-    "postinstall": "fumadocs-mdx",
+    "postinstall": "fumadocs-mdx && prisma generate",
     "prepare": "husky",
     "lint:images": "node scripts/check-images.mjs",
     "migrate:images": "node scripts/move-doc-images.mjs",