OnSched API 3.7.3 - capacity fallback fix

Availability

• GET /v3/availability and POST /v3/appointment/hold: Default Service or Resource bookingsPerSlot: 1 now acts as fallback capacity instead of capping the other entity's higher same-slot capacity. For example, a Resource with bookingsPerSlot: 2 can accept a second concurrent hold even when the linked Service is left at its default bookingsPerSlot: 1.