Add paused subscribers to revoke schedule and reminders

Paused subscriptions leave coordinators missing revoke dates and delay member access changes. This creates revoke events and reminders so coordinators act before the next billing run.

Overview

When subscriptions pause, manual date calculations and missed reminders create operational friction for your small training team. This flow computes the correct billing-window revoke date, schedules the revoke event, and alerts coordinators so access changes happen reliably before the next billing run.