China Holiday Calendar Sync

Use only official gov.cn holiday notices as the source of truth for China holiday and adjusted-workday schedules.

Keep the workflow conservative:

• Prefer configured notice_urls first.
• Use China government policy search for discovery before any public-search fallback.
• Parse official notice正文 into structured holiday/workday rows.
• Treat future-year discovery as low-frequency work, not a daily poll.

Workflow

1. Load configured notice URLs.
   • Reuse known official notice URLs from local config first.
   • For already-synced years, prefer local calendar storage instead of refetching the notice page.