docs(plugin): add X Article publisher to examples

[genoooool]

Description

Adds opencli-plugin-x-article-publisher to the English and Chinese community plugin listings.

The plugin provides opencli x-article publish for creating or publishing X long-form Articles from Markdown with local cover and inline images. It uses OpenCLI's UI browser bridge plus xPoster, and separates local prepare-only validation, remote draft creation, and explicit public execution.

Related issue: None

Type of Change

• 🐛 Bug fix
• ✨ New feature
• 🌐 New site adapter
• 📝 Documentation
• ♻️ Refactor
• 🔧 CI / build / tooling

Checklist

• I ran the checks relevant to this PR
• I updated tests or docs if needed
• I included output or screenshots when useful

Documentation (if adding/modifying an adapter)

• Added doc page under docs/adapters/ (if new adapter)
• Updated docs/adapters/index.md table (if new adapter)
• Updated sidebar in docs/.vitepress/config.mts (if new adapter)
• Updated README.md / README.zh-CN.md when command discoverability changed
• Used positional args for the command's primary subject unless a named flag is clearly better
• Normalized expected adapter failures to CliError subclasses instead of raw Error

Screenshots / Output

Plugin checks completed before this documentation PR:

• node --check publish.js
• opencli validate x-article/publish: PASS, 0 errors, 0 warnings
• Real article --prepare-only: prepared, 1 cover, 5 inline images, 336 body blocks, with no X side effect
• git diff --check: PASS