自动排队生成量化因子挖掘任务，心跳派发后将高 IC 因子入库。

Co-authored-by: Cursor <cursoragent@cursor.com>

app/schemas.py

@@ -128,6 +128,7 @@ class HeartbeatOut(APIModel):
     recoverable_stake_amount: MoneyText | None = None
     purchase_amount: MoneyText | None = None
     estimated_daily_points: MoneyText | None = None
+    assigned_task: TaskOut | None = None
 
 
 class TaskOut(APIModel):
@@ -358,3 +359,4 @@ class DatacenterView(DatacenterOut):
 
 
 DashboardOut.model_rebuild()
+HeartbeatOut.model_rebuild()