fix: update docker action test to expect ok field

dashboard/backend/tests/integration/test_docker.py

@@ -42,7 +42,7 @@ class TestDockerContainerActions:
 
         assert response.status_code == 200
         data = response.json()
-        assert "message" in data or "status" in data
+        assert data["ok"] is True
 
     def test_stop_container_success(self, test_app, admin_headers, mock_docker_client):
         """Test stopping a container."""