Description

Add published_at column to xiaohongshu search by deriving approximate publish date from note IDs. XHS note IDs follow MongoDB ObjectID format where the first 8 hex characters encode a Unix timestamp. This is parsed client-side with UTC+8 offset for China timezone, requiring zero extra network requests.

Related issue: #484

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

$ opencli xiaohongshu search '特斯拉' --limit 3
┌───────┬──────────────────────────────────────────┬──────────────────┬───────┬──────────────┬────────────────────┐
│ rank  │ title                                    │ author           │ likes │ published_at │ url                │
├───────┼──────────────────────────────────────────┼──────────────────┼───────┼──────────────┼────────────────────┤
│ 1     │ 廉价版特斯拉Model 3标准版生产线落地上海  │ 大厂新视野       │ 4     │ 2026-03-26   │ https://...        │
│ 2     │ 特斯拉最新价格预测...                    │ W隐于市W         │ 18    │ 2026-03-24   │ https://...        │
│ 3     │ 每日一家公司职场内幕——特斯拉（上海）      │ 打工没有自由     │ 221   │ 2025-12-29   │ https://...        │
└───────┴──────────────────────────────────────────┴──────────────────┴───────┴──────────────┴────────────────────┘