chore(celery): enable broker retry on startup

src/settings/base.py

@@ -205,6 +205,10 @@ BACKUP_EXPORT_DIRECTORY = os.getenv(
     str(PROJECT_ROOT / "media" / "backups"),
 )
 
+# Celery: сохраняем ретраи подключения на старте и для 6.x совместимости.
+CELERY_BROKER_CONNECTION_RETRY = True
+CELERY_BROKER_CONNECTION_RETRY_ON_STARTUP = True
+
 
 # Password validation
 AUTH_PASSWORD_VALIDATORS = [