feat: 接入模型动态 Fallback 与调用审计

core/backend/apps/ai/tasks.py

@@ -63,7 +63,7 @@ def generate_model_triview_task(self, task_id: str) -> str:
 @app.task(bind=True, max_retries=0)
 def poll_free_video_task(self, task_id: str, attempt: int = 0) -> str:
     """自由创作视频·worker 兜底轮询:每 30s 一次自重排(不依赖 celery beat),
-    上限 60 次(≈30 分钟,足够 Seedance 5-10 分钟出片)。finalize 幂等(POSTPROCESSING 认领),
+    总等待上限由统一视频 generation_timeout 配置控制。finalize 幂等(POSTPROCESSING 认领),
     与前端主动 poll 并存不双扣。轮询本身出错不重试(max_retries=0),下一次自重排继续。"""
     from apps.ai.free_video import finalize_free_video
     from apps.ai.models import AITask
@@ -82,7 +82,9 @@ def poll_free_video_task(self, task_id: str, attempt: int = 0) -> str:
 
     if getattr(dj_settings, "CELERY_TASK_ALWAYS_EAGER", False):
         return task_id
-    if task.status in (AITask.Status.SUBMITTED, AITask.Status.POLLING) and attempt < 60:
+    # 是否终止由 finalize_free_video 读取统一 generation_timeout 决定；这里不再维护一套
+    # “60 次轮询”硬编码，避免修改成片等待时限时 Worker 与 Web 轮询口径不一致。
+    if task.status in (AITask.Status.SUBMITTED, AITask.Status.POLLING):
         poll_free_video_task.apply_async(args=[task_id, attempt + 1], countdown=30)
     return task_id