防止服务端还未反应，轮询过早，反馈404报错

@@ -113,6 +113,11 @@ export const pollVideoStatus = (
             console.warn(`Gateway timeout (${res.status}), retrying poll...`);
             return;
           }
+          // Do not fail immediately on 404, the task might not be ready yet
+          if (res.status === 404) {
+             console.warn('Task not found (404), retrying poll...');
+             return;
+          }
           clearInterval(interval);
           reject(new Error(`HTTP error! status: ${res.status}`));
           return;