style: 修复black + isort格式问题（task_enqueue.py + 限流测试）

apps/api/app/core/task_enqueue.py

@@ -6,8 +6,8 @@ from app.core.celery_app import celery_app
 logger = logging.getLogger(__name__)
 
 # ── 限流阈值常量（全系统统一管理，不要在业务代码里硬编码） ──
-USER_PENDING_LIMIT = 3       # 单用户 pending 上限
-GLOBAL_PENDING_LIMIT = 20    # 全局 pending 上限
+USER_PENDING_LIMIT = 3  # 单用户 pending 上限
+GLOBAL_PENDING_LIMIT = 20  # 全局 pending 上限
 
 
 class UserPendingLimitExceeded(Exception):
@@ -71,9 +71,7 @@ def check_queue_limits(
                 user_pending,
                 user_pending_limit,
             )
-            raise UserPendingLimitExceeded(
-                user_id=user_id, pending_count=user_pending, limit=user_pending_limit
-            )
+            raise UserPendingLimitExceeded(user_id=user_id, pending_count=user_pending, limit=user_pending_limit)
 
 
 def _mark_task_failed_safely(
@@ -157,9 +155,7 @@ def safe_enqueue_generation_task(
                 user_pending,
                 user_pending_limit,
             )
-            exc = UserPendingLimitExceeded(
-                user_id=user_id, pending_count=user_pending, limit=user_pending_limit
-            )
+            exc = UserPendingLimitExceeded(user_id=user_id, pending_count=user_pending, limit=user_pending_limit)
             _mark_task_failed_safely(task, generation_task_repository, log_prefix, str(exc))
             raise exc
 
@@ -201,9 +197,7 @@ def safe_enqueue_generation_task(
             exc: Exception = GlobalQueueFull(pending_count=global_after, limit=global_pending_limit)
         else:
             reason = f"用户 pending 超限(入队后): {user_after}/{user_pending_limit}"
-            exc = UserPendingLimitExceeded(
-                user_id=user_id, pending_count=user_after, limit=user_pending_limit
-            )
+            exc = UserPendingLimitExceeded(user_id=user_id, pending_count=user_after, limit=user_pending_limit)
 
         logger.warning(
             "[队列限流] %s, task_id=%s, user_id=%s — 回滚状态为 failed",