docs: add Chinese translation (README.zh.md) with language toggle

[qiuyanlong16]

• Add language switch banner to README.md (English <-> 中文)
• Add README.zh.md with full Chinese translation of header, navigation, table of contents, ecosystem tools, security notice, and footer
• All 30 category section headers translated
• 5300+ skill entries kept as-is (proper nouns/project names)

Summary by CodeRabbit

Release Notes

• Documentation
  • Added language switcher to README header, enabling quick access between English and Chinese documentation versions.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: b98cb3dd-c5a2-4d80-bafc-9d0c1de8b4d5

📥 Commits

Reviewing files that changed from the base of the PR and between 0b0c6e2 and 0836d0d.

📒 Files selected for processing (2)

• README.md
• README.zh.md

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📝 Walkthrough

Walkthrough

This PR adds an inline language switcher to the README header, providing readers with quick links to both the English version (README.md) and Chinese version (README.zh.md) of the documentation. The selector is positioned in the top centered layout of the document for easy visibility and navigation.

Changes

Language Switcher in README Header

Layer / File(s)	Summary
Language selector header README.md	Lines 3-10 add an inline English/Chinese language switcher with links positioned in the top header section near the document banner.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A switcher springs to life so bright,
Between two tongues, left and right,
README dances, East meets West,
Language choices at their best!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main changes: adding a Chinese translation file (README.zh.md) and implementing a language toggle mechanism in the README.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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