refactor(core): introduce EventBus and refactor store infrastructure

- Add EventBus for decoupled event-driven communication between services
- Add EventSubscriber component for centralized event handling
- Add requestDedupe utility for shared request deduplication
- Refactor api/wsService to use eventBus instead of direct router navigation
- Extract MessageMapper.toCachedMessages for consistent message mapping
- Remove deprecated BaseManager and CacheBus classes
- Improve @mention rendering with memberMap support in segment rendering
- Update hooks to use useRef instead of useState for fetch tracking

src/data/mappers/MessageMapper.ts

@@ -12,6 +12,7 @@ import type {
   MessageResponse,
   UserDTO,
 } from '../../types/dto';
+import type { CachedMessage } from '../../database/types/CachedMessage';
 
 // 数据库消息记录类型
 export interface MessageDbRecord {
@@ -180,4 +181,23 @@ export class MessageMapper {
       avatar: sender.avatar || undefined,
     };
   }
+
+  static toCachedMessage(apiMessage: any, conversationId?: string): CachedMessage {
+    return {
+      id: apiMessage.id,
+      conversationId: apiMessage.conversation_id || conversationId || '',
+      senderId: apiMessage.sender_id,
+      content: apiMessage.content,
+      type: apiMessage.type || 'text',
+      isRead: apiMessage.is_read || false,
+      createdAt: apiMessage.created_at,
+      seq: apiMessage.seq,
+      status: apiMessage.status || 'normal',
+      segments: apiMessage.segments,
+    };
+  }
+
+  static toCachedMessages(apiMessages: any[], conversationId?: string): CachedMessage[] {
+    return apiMessages.map(m => this.toCachedMessage(m, conversationId));
+  }
 }