fix(doctor): derive booking state from booking_locations

The profile decided "نوبت‌دهی غیرفعال است" from `doctor.active` alone, while the
page already had `booking_locations` — the more precise source, since the backend
only returns locations that are genuinely bookable. The two could disagree, and
for a doctor bookable only at a clinic they did.

A shared `bookingState` helper now drives both the desktop card and the mobile
bar: any location means bookable, the label comes from the earliest
`next_available_at`, and locations with no capacity yet read as "فعلاً نوبت خالی
ندارد" rather than disabled. With no locations at all it falls back to the
previous `doctor.active` / `free_turn` fields.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/doctor/[slug]/page.js

@@ -267,6 +267,7 @@ async function Doctor({ params }) {
           rateAggregate={rateAggregate}
           addresses={addresses}
           bookableAddressUuids={[...bookableAddressUuids]}
+          bookingLocations={bookingLocations}
           slug={slug}
         />
       </Layout>