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/Representation/Repository/RepresentationRepository.php

@@ -24,9 +24,9 @@ class RepresentationRepository extends ServiceEntityRepository
         return $this->findOneBy(['user' => $user]);
     }
 
-    public function findActiveByCityId(int $cityId): ?Representation
+    public function findActiveByDomain(string $domain): ?Representation
     {
-        return $this->findOneBy(['cityId' => $cityId, 'active' => true]);
+        return $this->findOneBy(['domain' => $domain, 'active' => true]);
     }
 
     public function save(Representation $entity, bool $flush = true): void