fix: pollStatus 已 active 的素材跳过远程查询，防止跨项目素材被误删

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

backend/apps/generation/views.py

@@ -3446,7 +3446,8 @@ def asset_poll_status_view(request, asset_id):
     except Asset.DoesNotExist:
         return Response({'error': '素材不存在'}, status=status.HTTP_404_NOT_FOUND)
 
-    if asset.remote_asset_id:
+    # 已经 active 且有 URL 的素材跳过远程查询（避免跨项目素材被误删）
+    if asset.remote_asset_id and asset.status != 'active':
         from utils import assets_client
         from utils.assets_client import AssetsAPIError
         try:
@@ -3463,7 +3464,6 @@ def asset_poll_status_view(request, asset_id):
             asset.save(update_fields=['status', 'url', 'error_message'])
         except AssetsAPIError as e:
             error_str = str(e)
-            # 火山返回素材不存在 → 删除本地记录
             if 'not found' in error_str.lower() or 'NotFound' in e.code or 'NotExist' in e.code:
                 asset.delete()
                 return Response({'status': 'deleted', 'message': '素材在云端已被删除'})
@@ -3473,7 +3473,6 @@ def asset_poll_status_view(request, asset_id):
             )
         except Exception as e:
             error_str = str(e)
-            # 空响应 / JSON 解析失败 = 火山已删除该素材
             if 'Expecting value' in error_str or 'JSONDecodeError' in type(e).__name__:
                 logger.info('Asset %s appears deleted on remote (empty response), removing local record', asset.remote_asset_id)
                 asset.delete()