fix(appointment): correct payment flow and account-info prefill

- Booking response is double-nested: read appointment uuid/expires_at from
  res.data.data so the payment countdown and gateway redirect actually fire.
- Payment result page (/payment/[uuid]): unwrap res.data.data, use real
  backend fields (amount_rials, gateway, created_at, type) and statuses
  (pending/success/failed/canceled/refunded); the "pay" button now re-initiates
  via postAppointmentPayment instead of building a URL on the API origin.
- Add /payment/result interstitial that reads payment_uuid from the gateway
  callback and forwards to /payment/[uuid].
- Prefill account info correctly in the booking form: name from profile.label,
  insurances from *_id, gender as string, national_code editable unless approved.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

components/appointment/detail/SubmitData.js

@@ -125,10 +125,11 @@ function SubmitData({ setStep, data, prevData, setErrors, doctor, isForAnother,
         };
 
         const res = await request.postAppointment(appointmentPayload);
-        const appointmentUuid = res?.data?.uuid;
+        const appointment = res?.data?.data;
+        const appointmentUuid = appointment?.uuid;
         if (appointmentUuid) {
           setAppointmentId(appointmentUuid);
-          setAppointmentExpiresAt?.(res?.data?.expires_at ?? null);
+          setAppointmentExpiresAt?.(appointment?.expires_at ?? null);
         }
       }