- Add Calendar model with visibility settings and auto-subscription
- Add CalendarSubscription model for user subscriptions with permissions
- Add optional 'calendar' field to CalendarEvent (null=True for backward compatibility)
- Update CalendarEvent logic: if calendar=NULL uses legacy (department/employee), if calendar set uses new logic
- Add admin interfaces for Calendar and CalendarSubscription
- Add inline subscription editor in Calendar admin
- Migration 0011: create new tables and add calendar FK to events
- Full backward compatibility: existing code works without changes
Игорь Надеин
ef734f19c0