Returns feature names and their enabled state. Staff can see staff,
passenger and common flags; passengers see passenger and common flags;
guests see common flags. When no flags are visible the response is null.
Reservation migration flags retain their configured values for existing
clients; backend reservation behavior no longer depends on them.
Returns feature names and their enabled state. Staff can see staff, passenger and common flags; passengers see passenger and common flags; guests see common flags. When no flags are visible the response is null. Reservation migration flags retain their configured values for existing clients; backend reservation behavior no longer depends on them.