feat: add multi-city representation support and domain context resolution

- Created migration to add representation_cities table and domain, is_global fields to representations.
- Implemented SiteContextController to resolve domain to site context (city | representation | unknown).
- Developed DomainContext and DomainContextResolver services for domain mapping.
- Added tests for DomainContextResolver and commission logic based on domain ownership.

src/Doctor/Repository/DoctorRepository.php

@@ -75,6 +75,10 @@ class DoctorRepository extends ServiceEntityRepository
         if (!empty($filters['specialty_id'])) {
             $qb->andWhere('s.id = :specialty')->setParameter('specialty', (int) $filters['specialty_id']);
         }
+        // Scope دامنه‌ی نماینده‌ی سراسری (تزریق‌شده توسط DomainContextResolver در کنترلر).
+        if (!empty($filters['representation_id'])) {
+            $qb->andWhere('d.representationId = :repId')->setParameter('repId', (int) $filters['representation_id']);
+        }
         if (!empty($filters['gender'])) {
             $qb->andWhere('d.gender = :gender')->setParameter('gender', $filters['gender']);
         }