"""IT support / help-desk domain (求助域).

The free-form "I have an IT problem" surface that the rigid request templates
(laptop / seat / DNS / …) never covered — closing the employee dead-end.
A ticket carries a full lifecycle (open → triaging → in_progress →
waiting_requester → resolved → closed, with reopen + cancel) and a message
timeline for the back-and-forth between the requester and IT. Notifications
go through the governed notification outbox (so the employee's preferences /
quiet hours apply to ticket updates); a best-effort interactive card is posted
to the IT Feishu group so staff can triage from chat.
"""