fix(server): Fix vercel.json schema - includeFiles should be string not array

Agent-Logs-Url: https://github.com/objectstack-ai/framework/sessions/1245e678-d4d6-4f94-8c34-64c7bced2044

Co-authored-by: xuyushun441-sys <255036401+xuyushun441-sys@users.noreply.github.com>

Author: Claude

apps/server/vercel.json

@@ -13,10 +13,7 @@
     "api/**/*.js": {
       "memory": 1024,
       "maxDuration": 60,
-      "includeFiles": [
-        "node_modules/@libsql/**",
-        "node_modules/better-sqlite3/**"
-      ]
+      "includeFiles": "node_modules/{@libsql,better-sqlite3}/**"
     }
   },
   "headers": [