diff --git a/packages/shared/ai_client.py b/packages/shared/ai_client.py
index fb2a75630..819aa61ba 100755
--- a/packages/shared/ai_client.py
+++ b/packages/shared/ai_client.py
@@ -297,18 +297,22 @@ class DoubaoClient:
         if image_url:
             if has_extra_refs:
                 # omni_reference：首张图作为 reference_image，允许指定 ratio
-                content.append({
-                    "type": "image_url",
-                    "image_url": {"url": image_url},
-                    "role": "reference_image",
-                })
+                content.append(
+                    {
+                        "type": "image_url",
+                        "image_url": {"url": image_url},
+                        "role": "reference_image",
+                    }
+                )
             else:
                 # 纯首帧：不带 role，服务端识别为 first_frame（或显式 role=first_frame）
-                content.append({
-                    "type": "image_url",
-                    "image_url": {"url": image_url},
-                    "role": "first_frame",
-                })
+                content.append(
+                    {
+                        "type": "image_url",
+                        "image_url": {"url": image_url},
+                        "role": "first_frame",
+                    }
+                )
         for u in ref_imgs:
             content.append({"type": "image_url", "image_url": {"url": u}, "role": "reference_image"})
         for u in ref_audios:
@@ -358,7 +362,7 @@ class DoubaoClient:
                         except Exception as ee:
                             last_err = ee
                             if attempt < self.max_retries:
-                                time.sleep(0.5 * (2 ** attempt))
+                                time.sleep(0.5 * (2**attempt))
                                 continue
                             return None, last_err, sc, body
                     data = resp.json()
@@ -369,8 +373,14 @@ class DoubaoClient:
                 except Exception as e:
                     last_err = e
                     if attempt < self.max_retries:
-                        wait = 0.5 * (2 ** attempt)
-                        logger.warning("Seedance 创建任务失败，%.1fs 后重试 (%d/%d): %s", wait, attempt + 1, self.max_retries + 1, e)
+                        wait = 0.5 * (2**attempt)
+                        logger.warning(
+                            "Seedance 创建任务失败，%.1fs 后重试 (%d/%d): %s",
+                            wait,
+                            attempt + 1,
+                            self.max_retries + 1,
+                            e,
+                        )
                         time.sleep(wait)
             return None, last_err, 0, ""
 
@@ -378,7 +388,16 @@ class DoubaoClient:
         task_id, last_err, sc, body = _do_create(create_payload)
 
         # ratio 兜底：HTTP 400 且 body 提到 ratio / adaptive → 回退 adaptive 再试一次
-        if not task_id and sc == 400 and final_ratio != "adaptive" and ("ratio" in (body or "").lower() or "aspect" in (body or "").lower() or "adaptive" in (body or "").lower()):
+        if (
+            not task_id
+            and sc == 400
+            and final_ratio != "adaptive"
+            and (
+                "ratio" in (body or "").lower()
+                or "aspect" in (body or "").lower()
+                or "adaptive" in (body or "").lower()
+            )
+        ):
             logger.warning("Seedance 创建因 ratio 失败，回退 ratio=adaptive 重试")
             create_payload["ratio"] = "adaptive"
             task_id, last_err, sc2, body2 = _do_create(create_payload)
@@ -388,7 +407,10 @@ class DoubaoClient:
                 "Seedance 创建任务最终失败: model=%s base_url=%s err=%s body=%s  【排查】"
                 "1) 方舟控制台已开通 doubao-seedance-2-5-260628；2) API Key 有该模型权限；"
                 "3) DOUBAO_BASE_URL=https://ark.cn-beijing.volces.com/api/v3；4) 参考素材 URL 公网可访问。",
-                video_model, self.base_url, last_err, (body or "")[:500],
+                video_model,
+                self.base_url,
+                last_err,
+                (body or "")[:500],
             )
             return None
 
@@ -444,7 +466,11 @@ class DoubaoClient:
         if not video_url:
             logger.error(
                 "Seedance 任务未成功: task_id=%s last_status=%s polls=%d err=%s (总等待 %.0fs)",
-                task_id, last_status, poll_count, last_err, total_timeout,
+                task_id,
+                last_status,
+                poll_count,
+                last_err,
+                total_timeout,
             )
             return None
 
@@ -454,7 +480,9 @@ class DoubaoClient:
             os.makedirs(out_dir, exist_ok=True)
             local_path = f"{out_dir}/seedance_{task_id}_{uuid.uuid4().hex[:8]}.mp4"
             download_timeout = 120.0
-            logger.info("Seedance 开始下载: task_id=%s url=%s timeout=%.0fs", task_id, video_url[:120], download_timeout)
+            logger.info(
+                "Seedance 开始下载: task_id=%s url=%s timeout=%.0fs", task_id, video_url[:120], download_timeout
+            )
             with httpx.stream("GET", video_url, timeout=download_timeout) as r:
                 r.raise_for_status()
                 downloaded = 0