feat(secretary): implement multi-doctor assignment for clinic secretaries

- Added functionality to assign a single secretary to multiple doctors within a clinic, allowing for scoped access to appointments.
- Introduced `SecretaryService` to handle the logic for assigning and syncing doctors for a secretary.
- Updated `SecretaryController` to support multi-doctor assignment via new endpoints and modified existing ones.
- Enhanced `DoctorSecretary` entity to include secretary UUID in its serialized output.
- Implemented repository methods to facilitate the retrieval and management of doctor-secretary relationships.
- Adjusted appointment filtering in `MyAppointmentsController` to ensure secretaries only see appointments for assigned doctors.
- Created tests to validate the new multi-doctor assignment functionality and appointment access restrictions.
- Updated frontend components to support multi-select for doctors in the secretary management UI.

config/services.yaml

@@ -133,6 +133,10 @@ services:
         arguments:
             $appUrl: '%env(APP_BASE_URL)%'
 
+    App\Secretary\Service\SecretaryService:
+        arguments:
+            $appUrl: '%env(APP_BASE_URL)%'
+
     App\Auth\Controller\PreRegistrationController:
         arguments:
             $appUrl: '%env(APP_BASE_URL)%'