"""飞书服务台 (Feishu Helpdesk) 外部工单接入域.

Pulls ticket data from the Feishu Open Platform Helpdesk API
(``/open-apis/helpdesk/v1/tickets``) into ``feishu_helpdesk_tickets`` for
analytics + reporting. This is a **read-only mirror of an external
system** — distinct from the internal ``support`` ticketing domain
(``support_tickets``), which is Helix's own help-desk tooling.

Credentials live in the unified ``integrations`` table as
``kind='helpdesk', provider='feishu'`` rows (one per 服务台). Each row is
self-contained (app_id / app_secret / helpdesk_id / helpdesk_token), so a
租户可挂多个服务台 by adding more rows — no code change.
"""