docs: standardize Chinese documentation and fix broken links

[JasonYeYuhe]

docs: standardizing Chinese documentation to README.zh.md

Overview

This PR aims to standardize the Chinese documentation naming convention and fix minor broken links in the README files.

Changes

• Added README.zh.md: Renamed/Migrated from README_CN.md (while keeping both for compatibility if needed, but updated all internal references to use the standardized .zh.md extension). This follows GitHub's common practice for automatic language detection.
• Fixed broken links: Corrected a typo in the last-commit-shield-link (changed commcommits to commits) which was causing the "Last Commit" badge link to be broken in the Chinese version.
• Updated language switchers: Synchronized the language selection links across README.md, README.zh.md, and README_JA.md to point to the new README.zh.md.

Why this matters

1. Consistency: Using the .zh.md extension aligns with community standards and improves discoverability for developers using localized GitHub settings.
2. Maintenance: Fixing the broken commit badge link ensures a professional and high-quality presentation for users interested in project activity.
3. Navigability: Unified language links across all README variants provide a seamless switching experience.

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Translated and contributed by @JasonYeYuhe

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[github-actions]

Failed to generate code suggestions for PR

[Copilot]

Pull request overview

This PR standardizes the Chinese top-level README naming to README.zh.md (for GitHub language conventions) and updates README cross-links, while also fixing a broken “Last Commit” badge link in the legacy Chinese README.

Changes:

• Add README.zh.md as the standardized Chinese README entrypoint.
• Update language switcher links in README.md and README_JA.md to point to README.zh.md.
• Fix the broken last-commit-shield-link URL in README_CN.md.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
README.md	Updates the Chinese language switcher link to README.zh.md.
README_JA.md	Updates the Chinese language switcher link to README.zh.md.
README_CN.md	Fixes the broken “Last Commit” badge link target URL.
README.zh.md	Introduces the standardized Chinese README and updates/contains documentation links.

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[Copilot]

The standalone -- line looks like an accidental typo (likely intended to be a Markdown horizontal rule ---). As-is it renders as plain text and breaks the section formatting.

Suggested change

	--
	---

[Copilot]

This link targets examples/openclaw-plugin/README.zh.md, but that file does not exist in the repo (only README_CN.md / README.md are present). This will render as a broken link; either add the README.zh.md file in that directory or update the link to an existing localized README.

Suggested change

	👉 **[查看：OpenClaw 上下文插件](examples/openclaw-plugin/README.zh.md)**
	👉 **[查看：OpenCode 记忆插件示例](examples/opencode-memory-plugin/README.zh.md)**
	👉 **[查看：OpenClaw 上下文插件](examples/openclaw-plugin/README_CN.md)**
	👉 **[查看：OpenCode 记忆插件示例](examples/opencode-memory-plugin/README_CN.md)**

[Copilot]

This link targets examples/opencode-memory-plugin/README.zh.md, but that file does not exist (the directory currently has README_CN.md / README.md). Please update the link to an existing file or add the missing README.zh.md to avoid a broken reference.

Suggested change

	👉 **[查看：OpenCode 记忆插件示例](examples/opencode-memory-plugin/README.zh.md)**
	👉 **[查看：OpenCode 记忆插件示例](examples/opencode-memory-plugin/README_CN.md)**

[Copilot]

This link points to bot/README.zh.md, but the bot/ directory currently contains README_CN.md / README.md and no README.zh.md. This will be a broken link unless the file is added or the link is updated to the correct target.

Suggested change

	👉 **[查看：使用 VikingBot 部署服务器](bot/README.zh.md)**
	👉 **[查看：使用 VikingBot 部署服务器](bot/README_CN.md)**