chore(deps): bump openai from 4.104.0 to 6.16.0

Bumps [openai](https://github.com/openai/openai-node) from 4.104.0 to 6.16.0.
- [Release notes](https://github.com/openai/openai-node/releases)
- [Changelog](https://github.com/openai/openai-node/blob/master/CHANGELOG.md)
- [Commits](openai/openai-node@v4.104.0...v6.16.0)

---
updated-dependencies:
- dependency-name: openai
  dependency-version: 6.16.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

packages/cli/package.json

@@ -25,7 +25,7 @@
     "@types/node": "^25.0.8",
     "cac": "^6.7.14",
     "dotenv": "^16.4.5",
-    "openai": "^4.0.0",
+    "openai": "^6.18.0",
     "typescript": "^5.9.3"
   }
 }

packages/site/package.json

@@ -27,7 +27,7 @@
     "fumadocs-ui": "16.5.1",
     "lucide-react": "^0.563.0",
     "next": "16.1.6",
-    "openai": "^4.0.0",
+    "openai": "^6.18.0",
     "react": "^19.2.4",
     "react-dom": "^19.2.4",
     "remark-directive": "^4.0.0",