docs: complete configuration guide

[chenjiahan]

Summary

This PR completes the English and Chinese configuration guides so users can configure the Rstack toolchain from a single file.

It documents configuration discovery, on-demand dependency loading, every define.*() API, test inheritance behavior, command mappings, and links to the underlying tools.

[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: fc03484e-f3b2-414d-9445-fb05d1bbd69d

📥 Commits

Reviewing files that changed from the base of the PR and between 0c51d61 and 039eff8.

📒 Files selected for processing (2)

• website/docs/en/guide/configuration.mdx
• website/docs/zh/guide/configuration.mdx

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📝 Walkthrough

Walkthrough

Populated the English and Chinese Rstack configuration guides. The documentation now covers configuration file discovery, the global config option, command-specific loading, dynamic dependency imports, and mappings for all define.*() APIs. It also documents application, library, documentation, test, lint, and staged configurations, including test inheritance behavior and the requirement for define.staged() when using rs staged.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: completing the configuration guide docs.
Description check	✅ Passed	The description accurately describes the documentation updates and matches the changed files.
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-configuration-guide

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