控制台改为选项卡，并支持封禁节点与下发计算任务。

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

app/services/heartbeat.py

@@ -40,6 +40,8 @@ def record_heartbeat(
     moment = now or utcnow()
     node = get_node_by_sn(session, sn.strip())
     assert_node_token(node, token)
+    if node.is_banned:
+        raise AppError("节点已封禁", 403)
     if node.license_expires_at <= moment:
         raise AppError("节点授权已到期", 403)
     bound_ip = (client_ip or "").strip() or None
@@ -65,6 +67,18 @@ def record_heartbeat(
     return node
 
 
+def set_node_banned(session: Session, node: ComputeNode, banned: bool, now: datetime | None = None) -> ComputeNode:
+    """封禁立即结束在线区间。解除后要等下一次心跳才会重新上线。"""
+    moment = now or utcnow()
+    node.is_banned = banned
+    node.updated_at = moment
+    if banned and node.status == NodeStatus.ONLINE:
+        _close_open_intervals(session, node.id, moment, "banned")
+        node.status = NodeStatus.OFFLINE
+    session.flush()
+    return node
+
+
 def mark_stale_nodes(session: Session, now: datetime | None = None) -> list[str]:
     """把超过心跳时限或授权已到期的在线节点置为 offline，并关闭在线区间。"""
     moment = now or utcnow()