feat: add service-based booking mode to appointment scheduling

- Introduced a new booking mode in WeeklySchedule to support service-based appointments.
- Updated SlotCalculatorService to calculate available start times based on selected service durations and buffer times.
- Enhanced AppointmentController to handle service items during booking, calculating slot_end on the server side.
- Implemented validation to ensure at least one bookable service exists for doctors in service mode.
- Added new API endpoint to retrieve available appointment slots based on selected services.
- Updated MyAppointmentsController to accept service items during appointment creation.
- Modified ServiceItem entity to include a bookable flag, allowing services to be marked for scheduling.
- Created migration to add bookable column to service_items table.
- Added tests for service-based slot calculations and validation logic.

assets/admin/pages/DoctorDetailPage.tsx

@@ -101,11 +101,15 @@ interface BookingMeta {
   online_booking_enabled: boolean;
   booking_window_value: number;
   booking_window_unit: 'week' | 'month';
+  booking_mode: 'slot' | 'service';
+  buffer_minutes: number;
 }
 const DEFAULT_BOOKING_META: BookingMeta = {
   online_booking_enabled: true,
   booking_window_value: 1,
   booking_window_unit: 'month',
+  booking_mode: 'slot',
+  buffer_minutes: 0,
 };
 interface WeeklyScheduleData { uuid: string; doctor_uuid: string; schedule: NewScheduleMap; meta?: BookingMeta; }
 
@@ -1384,6 +1388,53 @@ export function WeeklyScheduleTab({ doctorUuid, addresses, readOnly = false }: {
         </div>
       )}
 
+      {/* ─ روش نوبت‌دهی */}
+      <div className="mb-3 rounded-xl border border-slate-200 dark:border-gray-700 overflow-hidden">
+        <div className="px-4 py-3 bg-slate-50 dark:bg-gray-800/50">
+          <span className="text-sm font-medium text-slate-700 dark:text-slate-200">روش نوبت‌دهی</span>
+        </div>
+        <div className="px-4 py-3 space-y-3">
+          <div className="flex flex-wrap gap-2">
+            {([['slot', 'اسلاتی (مدت ثابت)'], ['service', 'بر اساس سرویس']] as const).map(([val, lbl]) => (
+              <button
+                key={val}
+                type="button"
+                onClick={() => setMeta(m => ({ ...m, booking_mode: val }))}
+                className={`px-3 py-1.5 text-sm rounded-lg border transition-colors ${
+                  meta.booking_mode === val
+                    ? 'bg-[var(--primary)] text-white border-[var(--primary)]'
+                    : 'bg-white dark:bg-gray-900 text-slate-600 dark:text-slate-300 border-slate-200 dark:border-gray-700'
+                }`}
+              >
+                {lbl}
+              </button>
+            ))}
+          </div>
+          {meta.booking_mode === 'service' ? (
+            <>
+              <div className="flex flex-wrap items-center gap-2">
+                <span className="text-sm text-slate-600 dark:text-slate-400">فاصله بین نوبت‌ها</span>
+                <input
+                  type="number"
+                  min={0}
+                  value={meta.buffer_minutes}
+                  onChange={(e) => setMeta(m => ({ ...m, buffer_minutes: Math.max(0, Number(e.target.value) || 0) }))}
+                  className="w-16 text-center text-sm rounded-lg border border-slate-200 dark:border-gray-700 bg-white dark:bg-gray-900 px-2 py-1.5 focus:outline-none focus:ring-0"
+                />
+                <span className="text-sm text-slate-600 dark:text-slate-400">دقیقه</span>
+              </div>
+              <p className="text-xs text-slate-400 dark:text-slate-500 leading-relaxed">
+                مدت هر نوبت از «مدت سرویس» انتخاب‌شده تعیین می‌شود. لازم است حداقل یک سرویس با «نمایش در نوبت‌دهی» در بخش <span className="font-medium">سرویس‌ها</span> تعریف کنید، وگرنه ذخیره نمی‌شود.
+              </p>
+            </>
+          ) : (
+            <p className="text-xs text-slate-400 dark:text-slate-500 leading-relaxed">
+              مدت هر نوبت از «زمان هر نوبت» در شیفت‌های زیر تعیین می‌شود.
+            </p>
+          )}
+        </div>
+      </div>
+
       {/* ─ نوبت‌دهی آنلاین */}
       <div className="mb-3 rounded-xl border border-slate-200 dark:border-gray-700 overflow-hidden">
         {/* header + toggle */}