Assign a crew to a work order

Assigns a crew to a work order, checking the crew's capacity first. Pass work_order_id and crew_id at the top level of the body. This is the API behind a dispatch board: use it to clear work orders that still need a crew.

• The crew must be active and work with the company; otherwise the request returns 404.
• The assignment is refused with 422 if the crew is already at or over its weekly capacity this week, or if it is already booked on overlapping dates.
• On success the crew is notified of the new assignment.
• The token's role must be able to view all company records or have the Work production jobs permission, or the token's user must have created the work order. The token needs the write scope.