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/api.py

@@ -72,6 +72,7 @@ from app.services.common import get_node_by_sn, get_user_by_wallet
 from app.services.datacenter import approve_application, list_applications, reject_application, submit_application
 from app.services.hardware import HardwareReport
 from app.services.hardware import display_node_id, displayed_population
+from app.services.alpha_queue import assign_queued_alpha_task, maybe_generate_alpha_batch
 from app.services.heartbeat import assert_node_token, record_heartbeat, set_node_banned
 from app.services.ip_guard import add_whitelist_ip, client_ip, list_whitelist, remove_whitelist_ip
 from app.services.orders import approve_order, list_orders, place_order, reject_order, render_client
@@ -327,6 +328,8 @@ def heartbeat(body: HeartbeatIn, request: Request, db: Db) -> HeartbeatOut:
         client_ip=client_ip(request),
         hardware_fingerprint=body.hardware_fingerprint,
     )
+    maybe_generate_alpha_batch(db)
+    assigned = assign_queued_alpha_task(db, node)
     days = node.recovery_days or 540
     return HeartbeatOut(
         sn=node.sn,
@@ -340,6 +343,7 @@ def heartbeat(body: HeartbeatIn, request: Request, db: Db) -> HeartbeatOut:
         recoverable_stake_amount=node.recoverable_stake_amount,
         purchase_amount=node.purchase_amount,
         estimated_daily_points=money(node.purchase_amount / Decimal(days)),
+        assigned_task=_task_out(assigned) if assigned is not None else None,
     )
 
 
@@ -514,8 +518,8 @@ def _admin_task_out(task: ComputeTask) -> AdminTaskOut:
     return AdminTaskOut(
         task_id=task.id,
         task_type=task.task_type,
-        target_node_sn=node.sn,
-        display_node_id=node.display_node_id,
+        target_node_sn=node.sn if node is not None else "",
+        display_node_id=node.display_node_id if node is not None else 0,
         status=task.status,
         payload=task.payload or {},
         result=task.result,