fix(jimeng_video_gen): 解决视频下载失败和状态检查问题

- 添加视频下载重试机制，最多重试3次
- 增加下载超时设置为60秒
- 添加下载失败时的错误提示信息
- 修复任务状态检查逻辑，避免空响应导致的错误
- 改进错误处理流程，提高脚本稳定性

scripts/jimeng_video_gen.py

@@ -89,9 +89,19 @@ def _submit_and_poll(req_key, body, output_path, max_wait=180, poll_interval=10)
         if resp_code == 10000 and resp_data.get('status') == 'done':
             video_url = resp_data.get('video_url')
             if video_url:
-                # 下载视频
+                # 下载视频（带重试）
                 print(f"[即梦视频] 生成完成，正在下载...")
-                video_data = requests.get(video_url).content
+                video_data = None
+                for attempt in range(3):
+                    try:
+                        video_data = requests.get(video_url, timeout=60, verify=False).content
+                        break
+                    except Exception as e:
+                        print(f"[即梦视频] 下载重试 ({attempt+1}/3): {e}")
+                        import time as _t; _t.sleep(3)
+                if video_data is None:
+                    print(f"[即梦视频] 下载失败，视频URL: {video_url[:200]}")
+                    return None
                 _ensure_dir(output_path)
                 with open(output_path, 'wb') as f:
                     f.write(video_data)
@@ -101,7 +111,7 @@ def _submit_and_poll(req_key, body, output_path, max_wait=180, poll_interval=10)
                 print(f"[即梦视频] 任务完成但未找到视频URL: {json.dumps(result, ensure_ascii=False)[:300]}")
                 return None
 
-        if resp_code != 10000 and resp_data.get('status') not in (None, 'running', 'pending'):
+        if resp_code != 10000 and (resp_data is None or resp_data.get('status') not in (None, 'running', 'pending')):
             print(f"[即梦视频] 任务失败: {json.dumps(result, ensure_ascii=False)[:300]}")
             return None