fix : use native SQL for JSON roles query in PostgreSQL

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/Repository/UserRepository.php

@@ -23,9 +23,17 @@ class UserRepository extends ServiceEntityRepository
      */
     public function findByRole(string $role): array
     {
+        $conn = $this->getEntityManager()->getConnection();
+        $sql  = 'SELECT id FROM "user" WHERE roles::text LIKE :role';
+        $ids  = $conn->executeQuery($sql, ['role' => '%"'.$role.'"%'])->fetchFirstColumn();
+
+        if ([] === $ids) {
+            return [];
+        }
+
         return $this->createQueryBuilder('u')
-            ->where('u.roles LIKE :role')
-            ->setParameter('role', '%"'.$role.'"%')
+            ->where('u.id IN (:ids)')
+            ->setParameter('ids', $ids)
             ->getQuery()
             ->getResult()
         ;