Replace getHotel/upsertHotel with listHotels/createHotel/updateHotel/deleteHotel
(multi-hotel per edition). Add listRooming, assignStay, assignTeamToHotel, and
unassignStay procedures for per-attendee room assignments. Update setFlightStatus
to include attendee's HotelStay in TRAVEL_CONFIRMED notification metadata.
Extend getTravelConfirmedTemplate to render room number and check-in/out dates.
All procedures are adminProcedure and audit-logged. 10 new unit tests green.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
