Add GET /api/v1/appointment-settings/month-availability/{doctorUuid}
?year=&month= (Gregorian) returning disabled_dates / enabled_dates for
the month plus the doctor's online_booking flag and window. Lives in
AppointmentController (per-method guards) so it is genuinely public —
the class-level IsGranted on AppointmentSettingsController would have
forced auth. Whitelisted in security.yaml (firewall + access_control).
Uses SlotCalculator::hasAnyAvailability per day, so holidays, closed
overrides, non-working days and out-of-window dates all come back
disabled.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
