docs: add testing guide

[chenjiahan]

Summary

Testing guidance was split between the README and documentation example, making the complete Rstack behavior harder to discover. This PR consolidates it into dedicated English and Chinese Testing guides for configuration, project types, automatic inheritance, and custom extends; removes the duplicate source content; groups the guide under Practices; and links it from related reference pages.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 957711a3-a098-4d29-81fb-7a869464e720

📥 Commits

Reviewing files that changed from the base of the PR and between 5a840bb and 2e4f75f.

📒 Files selected for processing (9)

• README.md
• examples/documentation/docs/api/_meta.json
• examples/documentation/docs/api/testing.mdx
• website/docs/en/guide/api-reference.mdx
• website/docs/en/guide/cli/test.mdx
• website/docs/en/guide/configuration.mdx
• website/docs/zh/guide/api-reference.mdx
• website/docs/zh/guide/cli/test.mdx
• website/docs/zh/guide/configuration.mdx

📝 Walkthrough

Walkthrough

Added English and Chinese testing documentation covering rs test, define.test(), testing APIs, single and multiple projects, external projects, and inheritance customization. Added navigation entries for the new guides and cross-references from API reference, CLI testing, and configuration documentation.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: adding a testing guide to the docs.
Description check	✅ Passed	The description matches the PR by describing the new testing guides, links, and Practices grouping.
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-testing-guide

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