docs: Add Chinese README translations for OpenCode and OpenClaw plugins

[SCPZ24]

Description

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)
• Performance improvement
• Test update

Changes Made

Translated the README.md to README_CN.md in /examples/openclaw-plugin, /examples/opencode/plugin and /examples/opencode-memory-plugin, with careful review of the translated content.

All references to English-version documentation in README_CN.md have been updated to their corresponding Chinese versions.

Testing

• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have tested this on the following platforms:
  • Linux
  • macOS
  • Windows

Checklist

• My code follows the project's coding style
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published

Screenshots (if applicable)

Additional Notes

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[github-actions]

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