chore: move runCLI from internal helpers to index export

[chenjiahan]

Summary

Move runCLI from internal helpers to index export.

Motivations:

• To remove all internal helpers.
• runCLI now can be used as a public API, it is still undocumented, but users can use it. So we will keep it stable and simple.

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

[netlify]

✅ Deploy Preview for rsbuild ready!

Name	Link
🔨 Latest commit	b859ef2
🔍 Latest deploy log	https://app.netlify.com/sites/rsbuild/deploys/6736b86e8159000008cbf3b4
😎 Deploy Preview	https://deploy-preview-3981--rsbuild.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	1 paths audited Performance: 70 (🟢 up 1 from production) Accessibility: 97 (no change from production) Best Practices: 100 (no change from production) SEO: 100 (no change from production) PWA: 60 (no change from production) View the detailed breakdown and full score reports

---

To edit notification comments on pull requests, go to your Netlify site configuration.