Global availability (defaults)

Stored in option `rocwp_wcphoto_availability`:

Timezone: WordPress timezone (fallback `UTC`).

Slot duration: 60 minutes; buffer: 0 minutes.

Min notice: 60 minutes before the start time.

Days ahead: 60 days; calendar bounds use this plus any session-specific range.

Weekly schedule: Mon–Fri 09:00–18:00 enabled; Sat/Sun disabled.