docs: refresh Chinese contributing guide (langage review requested)

[StaryMoon]

What does this PR do?

Improve repo

This refreshes parts of the Simplified Chinese docs against the current English source and addresses part of #6782.

Changes include:

• fix broken translation anchors from #nslations to #translations
• remove an extra translation-review section that is not present in the English source
• translate remaining English fragments around alphabetical ordering and archived links
• add the newer license-note guidance section
• add missing guidance for time-limited courses, YouTube short links, and honorifics
• polish stale Simplified Chinese wording in docs/CODE_OF_CONDUCT-zh.md

IMPORTANT

• Read our contributing guidelines.
• This is not a revision of a previously submitted PR.

Checklist

• Used an informative name for this pull request.
• Ran git diff --check.

Follow-up

• I will watch the GitHub Actions status and adjust if maintainers prefer a narrower translation scope.

[github-actions]

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[liangtovi-debug]

I reviewed the Simplified Chinese changes against the current English docs. The main wording is much more natural than the existing zh files, but I noticed two small translation leftovers that are still worth fixing when you resolve the current merge conflicts:

• In docs/CONTRIBUTING-zh.md, the Code of Conduct sentence still ends with ([translations](README.md#translations)). Since this PR is refreshing the Chinese docs, I think the visible link text should be localized, e.g. （[翻译](README.md#translations)）.
• In docs/CODE_OF_CONDUCT-zh.md, the footer link is still [Translations](README.md#translations). Same suggestion: [翻译](README.md#translations).

Also, this PR is a good partial refresh for Simplified Chinese, but #6782 also mentions docs/HOWTO-zh.md and the Traditional Chinese docs. It may help maintainers if the PR description explicitly says this is intentionally scoped to CONTRIBUTING-zh.md and CODE_OF_CONDUCT-zh.md, or if those remaining files are left for a follow-up PR.