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.

src/ClinicService/Controller/ClinicServiceController.php

@@ -176,6 +176,9 @@ class ClinicServiceController extends BaseController
             $dm = $data['duration_minutes'];
             $item->setDurationMinutes(($dm === null || $dm === '') ? null : (int) $dm);
         }
+        if (array_key_exists('bookable', $data)) {
+            $item->setBookable((bool) $data['bookable']);
+        }
 
         $this->itemRepo->save($item);
 
@@ -217,6 +220,9 @@ class ClinicServiceController extends BaseController
             $dm = $data['duration_minutes'];
             $item->setDurationMinutes(($dm === null || $dm === '') ? null : (int) $dm);
         }
+        if (array_key_exists('bookable', $data)) {
+            $item->setBookable((bool) $data['bookable']);
+        }
 
         $this->itemRepo->save($item);