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/i18n/locales/ko.json

@@ -38,7 +38,7 @@
       "configTemplate": "설정 템플릿",
       "pluginConfig": "플러그인 설정",
       "logViewer": "로그 뷰어",
-      "plannerMonitor": "플래너 & 리플라이어 모니터",
+      "maisakaMonitor": "MaiSaka 채팅 모니터",
       "localChat": "로컬 채팅",
       "settings": "설정"
     }