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新增全局 NotificationBus（asyncio fan-out pub/sub），SubAgent 任务完成/失败和 Cron 执行结束时向所有 WebSocket 订阅方广播事件。前端通过 useNotifications Hook 连接 /api/v1/notifications/ws，按类型 invalidate React Query 缓存， 移除 useTasks / useCron / DashboardPage 的定时轮询，降低无效请求。 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
NotificationBus（backend/agentpal/services/notification_bus.py）：基于asyncio.Queue的 fan-out pub/sub 总线，支持 256 消息缓冲、慢消费者丢弃、指数退避重连GET /api/v1/notifications/ws（notifications.py）：每 30 秒无消息时发送心跳{"type": "ping"}保持连接notification_bus.publish()广播事件，失败不影响主流程useNotificationsHook +NotificationProvider：连接 WS 端点，按INVALIDATION_MAPinvalidate React Query 缓存；指数退避自动重连（1s → 30s）useTasks（5s）、useCron（10s）、DashboardPage（30s）改为 WS 事件驱动 +staleTime，减少无效请求Test plan
backend/tests/unit/test_notification_bus.py— 覆盖 subscribe/publish/unsubscribe/慢消费者/广播等 9 个场景backend/tests/integration/test_notifications_ws.py— WebSocket 连接、消息收发、心跳🤖 Generated with Claude Code