Migrate frontend realtime messaging to SSE.

Switch service integrations and screen/store consumers from websocket events to SSE, and ignore generated dist-web artifacts.

Made-with: Cursor

src/services/systemNotificationService.ts

@@ -6,7 +6,7 @@
 
 import * as Notifications from 'expo-notifications';
 import { Platform, AppState, AppStateStatus } from 'react-native';
-import type { WSChatMessage, WSNotificationMessage, WSAnnouncementMessage } from './websocketService';
+import type { WSChatMessage, WSNotificationMessage, WSAnnouncementMessage } from './sseService';
 import { extractTextFromSegments } from '../types/dto';
 
 // 通知渠道配置
@@ -169,9 +169,9 @@ class SystemNotificationService {
       data: {
         type: message.type,
         id: String(message.id),
-        senderId: message.sender_id,
-        receiverId: message.receiver_id,
-        systemType: message.system_type,
+        senderId: message.sender_id || '',
+        receiverId: message.receiver_id || '',
+        systemType: message.system_type || '',
         extraData: JSON.stringify(message.extra_data || {}),
       },
       type,