feat: add MaiSaka real-time chat flow monitoring component and WebSocket event handling

- Implemented the MaiSakaMonitor component for real-time monitoring of chat flow using WebSocket.
- Created a custom hook `useMaisakaMonitor` to manage WebSocket subscriptions and event states.
- Developed a backend module for broadcasting various monitoring events through WebSocket.
- Added serialization functions for messages and tool calls to optimize data transmission.
- Included event emission functions for session start, message ingestion, cycle start, timing gate results, planner requests/responses, tool executions, and replier requests/responses.

dashboard/src/router.tsx

@@ -156,7 +156,7 @@ const logsRoute = createRoute({
   component: LogViewerPage,
 })
 
-// 计划器&恢复器监控路由
+// MaiSaka 聊天流监控路由
 const plannerMonitorRoute = createRoute({
   getParentRoute: () => protectedRoute,
   path: '/planner-monitor',