- Add AvailabilityStatusDetails record and GetStatusDetailsAsync() to
IAvailabilityService; implement in PersistentAvailabilityService so the
admin-set reason stored in the database is returned alongside the status
- AvailabilityController.GetStatus() now returns the stored message instead
of hardcoded English strings
- Add messageAvailable / messageMaintenance / messageUnavailable translation
keys in en + nl so default messages are fully translatable
- AvailabilityStatusBadge: Available always shows the translated default;
Maintenance and Unavailable show the custom admin reason when set,
otherwise fall back to the translated default
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
SluijsensandClaude Haiku 4.5
d8b0484803