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/screens/message/ChatScreen.tsx

@@ -211,6 +211,17 @@ export const ChatScreen: React.FC = () => {
   } = useChatScreen();
   const displayMessages = useMemo(() => [...messages].reverse(), [messages]);
 
+  const longPressMenuMemberMap = useMemo(() => {
+    const map = new Map<string, { nickname: string; user_id: string }>();
+    groupMembers.forEach(m => {
+      map.set(m.user_id, {
+        nickname: m.nickname || m.user?.nickname || '用户',
+        user_id: m.user_id,
+      });
+    });
+    return map;
+  }, [groupMembers]);
+
   useEffect(() => {
     if (!loadingMore && showEdgeLoadingIndicator) {
       setShowEdgeLoadingIndicator(false);
@@ -629,6 +640,7 @@ export const ChatScreen: React.FC = () => {
         onReply={handleReplyMessage}
         onRecall={handleRecall}
         onDelete={handleDeleteMessage}
+        memberMap={longPressMenuMemberMap}
       />
       
       {/* 图片查看器 */}