docs: add API reference

[chenjiahan]

This PR adds a centralized API reference so users can discover Rstack's main entry point, re-exported tool APIs, and TypeScript type entry points in one place.

It documents the recommended rstack/* import paths with aligned English and Chinese examples and adds the page to both sidebars.

[cloudflare-workers-and-pages]

Deploying rstack-cli with    Cloudflare Pages

Latest commit:	07ce4dc
Status:	✅  Deploy successful!
Preview URL:	https://e054f23a.rstack-cli.pages.dev
Branch Preview URL:	https://chenjiahan-docs-api-referenc.rstack-cli.pages.dev

View logs

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 60d447e7-3069-41a6-aa70-96a420e432df

📥 Commits

Reviewing files that changed from the base of the PR and between f8385c6 and 07ce4dc.

📒 Files selected for processing (4)

• website/docs/en/guide/_meta.json
• website/docs/en/guide/api-reference.mdx
• website/docs/zh/guide/_meta.json
• website/docs/zh/guide/api-reference.mdx

---

📝 Walkthrough

Walkthrough

Added localized API reference pages documenting Rstack entry points, tool subpaths, and TypeScript type configuration. Registered the new page in the English and Chinese guide navigation metadata with localized labels.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly matches the main change: adding an API reference documentation page.
Description check	✅ Passed	The description accurately describes the new centralized API reference and the added English and Chinese examples.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chenjiahan/docs-api-reference

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}