Add Nolebase enhanced readabilities plugin

[jinzhongjia]

Integrates @nolebase/vitepress-plugin-enhanced-readabilities to enhance documentation readability.

Changes

• Added @nolebase/vitepress-plugin-enhanced-readabilities dependency
• Configured SSR settings to handle uncompiled Vue components from the plugin
• Integrated the plugin into the VitePress theme with:
  • Layout Switch feature enabled (Spotlight disabled)
  • Navigation bar menu component
  • Mobile/screen navigation menu component
• Chinese translations automatically applied via site's lang: zh-CN configuration

Why

Improves documentation readability and user experience by providing layout switching and related readability features that benefit all site visitors.

[gemini-code-assist]

Code Review

This pull request integrates the @nolebase/vitepress-plugin-enhanced-readabilities plugin into the VitePress project, configuring Vite's SSR settings to process the plugin and registering its menu components in the theme. The feedback recommends explicitly adding less to devDependencies in package.json to avoid potential build failures, as the plugin uses Less for styling and is compiled on the fly.

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[gemini-code-assist]

Since @nolebase/vitepress-plugin-enhanced-readabilities and @nolebase/ui use Less for styling and are configured under ssr.noExternal (meaning Vite compiles their Vue components and styles on the fly), Vite requires the less preprocessor to be available in the host project. Relying on transitive dependencies for Vite preprocessors can lead to build failures in environments with strict package managers (like pnpm) or certain CI/CD pipelines. It is highly recommended to explicitly add less to your devDependencies.

Suggested change

	"@nolebase/vitepress-plugin-enhanced-readabilities": "^2.18.2",
	"@nolebase/vitepress-plugin-enhanced-readabilities": "^2.18.2",
	"less": "^4.6.7",