[WIP] Feat: Add full chinese translation [Clanker task]

[Copilot]

• Update docusaurus.config.ts to add Chinese (cn) locale to i18n configuration
• Generate translation keys by running pnpm write-translations --locale cn
• Add Translate component imports to markdown files in docs/ folder
• Wrap plain text strings in markdown files with <Translate> components
• Generate initial Chinese translations for all extracted keys
• Test the implementation with Chinese locale
• Ensure build and functionality work correctly

Plan: Implement full Chinese translation support for Homarr documentation by adding i18n configuration, extracting strings from markdown files, and creating initial Chinese translations.

Fixes #360.

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