check_suite payloads carry no details_url; the build log lives on the
underlying check_run. For failed suites, fetch the suite's check runs with
an installation token and inject the first run's details_url (preferring
the Cloudflare run) as a Build Log field.
- add feishu_links D1 table and link store helpers
- implement X-Lark-Signature verification, url_verification, /gh login|logout|comment|merge|close and card.action.trigger Merge/Close
- render interactive cards with clickable title link, inline links and callback buttons (no whole-card card_link)
- bind Feishu account in OAuth callback
- document event subscription and required scopes