fix(appointment): unwrap doctor response and drop dead not-available call

The doctor endpoint is triple-nested, so doctorRes.data left doctor.id
undefined and the booking page received a broken doctor object. Extract
with data?.data?.data and remove the disabledDates fetch to the
nonexistent /appointment/not-available route (404); pass [] so the date
picker enables all dates and lets the slots response gate availability.

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

app/appointment/[doctorId]/page.js

@@ -8,25 +8,16 @@ async function Appointment({ params }) {
   const API_URL = process.env.NEXT_PUBLIC_API_URL;
 
   let doctor = null;
-  let disabledDates = [];
 
   try {
     const doctorRes = await axiosInstance.get(`${API_URL}/api/v1/doctor/${doctorId}`);
-    doctor = doctorRes.data;
-
-    if (doctor && doctor.id) {
-      const disabledDatesRes = await axiosInstance.get(
-        `${API_URL}/api/v1/appointment/not-available/${doctor.id}`,
-        { headers: { "Content-Type": "application/json" } }
-      );
-      disabledDates = disabledDatesRes.data?.data || [];
-    }
+    doctor = doctorRes.data?.data?.data;
   } catch (error) {}
 
   return (
     <AppointmentPage
       doctor={doctor}
-      disabledDates={disabledDates}
+      disabledDates={[]}
       matchedCity={matchedCity}
     />
   );