fix(appointment): use existing doctor image as fallback

The appointment info/location headers fell back to /default-doctor.jpg,
which does not exist in public/, so the Next image optimizer returned
400 for doctors without a photo. Point the fallback at the existing
/assets/images/doctor.png (same default used on the doctor page).

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

components/appointment/information/Head.js

@@ -3,7 +3,7 @@ import { imageUrl } from "@/helper";
 
 function Head({ doctor }) {
   // تبدیل img array به string
-  const doctorImage = imageUrl(doctor?.img?.[0]?.url, "/default-doctor.jpg");
+  const doctorImage = imageUrl(doctor?.img?.[0]?.url, "/assets/images/doctor.png");
 
   // تبدیل specialties array به string
   const expertiseText = doctor?.specialties

components/appointment/location/Head.js

@@ -3,7 +3,7 @@ import { imageUrl } from "@/helper";
 
 function Head({ doctor }) {
   // تبدیل img array به string
-  const doctorImage = imageUrl(doctor?.img?.[0]?.url, "/default-doctor.jpg");
+  const doctorImage = imageUrl(doctor?.img?.[0]?.url, "/assets/images/doctor.png");
 
   // تبدیل specialties array به string
   const expertiseText = doctor?.specialties