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Allow per-host schedule selection for round-robin event types

Allow per-host schedule selection for round-robin event types: a task in bird-critic-1.5-full-300 (Harbor dataset). Round-robin event types currently use each host's default availability schedule. This PR lets each host in a round-robin event type be assigned a specific non-default schedule …

The task

Round-robin event types currently use each host's default availability schedule. This PR lets each host in a round-robin event type be assigned a specific non-default `schedule`, stored as `scheduleId` on the `Host` model. Availability slot computation then uses that host-specific schedule instead of the user's…

Part of kochsnow/bird-critic-1.5-full-300.