refactor(message): replace SubscriptionManager with Zustand selectors

Remove custom SubscriptionManager class and adopt Zustand's built-in
selector mechanism for reactive state updates. This simplifies the
architecture by eliminating manual subscription management and relying
on Zustand's automatic dependency tracking for component re-renders.

Key changes:
- Remove SubscriptionManager class from store.ts
- Replace all notifySubscribers calls with direct store updates
- Update hooks to use Zustand selectors with useShallow for complex data
- Remove subscribe/unsubscribe patterns from MessageManager
- Simplify EmbeddedChat to use selector instead of local state
- Rename requestConversationListRefresh to refreshConversations

src/screens/message/ChatScreen.tsx

@@ -12,7 +12,7 @@
  * - useChatScreen.ts: 自定义Hook，管理所有状态和逻辑
  * - EmojiPanel.tsx: 表情面板组件
  * - MorePanel.tsx: 更多功能面板组件
- * - MentionPanel.tsx: @成员选择面板组件
+ * - MentionPanel.tsx: @成员选择  面板组件
  * - LongPressMenu.tsx: 长按菜单组件
  * - ChatHeader.tsx: 聊天头部组件
  * - MessageBubble.tsx: 消息气泡组件
@@ -258,10 +258,7 @@ export const ChatScreen: React.FC = () => {
   useEffect(() => {
     const unsubscribe = navigation.addListener('beforeRemove', () => {
       // 刷新会话列表，确保已读状态正确显示
-      messageManager.requestConversationListRefresh('chat-before-remove', {
-        force: true,
-        allowDefer: false,
-      });
+      messageManager.refreshConversations(true, 'chat-before-remove');
     });
     return unsubscribe;
   }, [navigation]);

src/screens/message/components/EmbeddedChat.tsx

@@ -22,7 +22,7 @@ import { Image as ExpoImage } from 'expo-image';
 import { spacing, fontSizes, shadows, useAppColors, type AppColors } from '../../../theme';
 import { ConversationResponse, MessageResponse, MessageSegment, GroupMemberResponse, ImageSegmentData } from '../../../types/dto';
 import { Avatar, Text, ImageGallery, AppBackButton } from '../../../components/common';
-import { useAuthStore, messageManager, MessageEvent, MessageSubscriber } from '../../../stores';
+import { useAuthStore, messageManager, useMessageStore } from '../../../stores';
 import { formatDistanceToNow } from 'date-fns';
 import { zhCN } from 'date-fns/locale';
 import { extractTextFromSegments } from '../../../types/dto';
@@ -302,8 +302,8 @@ export const EmbeddedChat: React.FC<EmbeddedChatProps> = ({ conversation, onBack
   // 使用 markAsRead hook
   const { markAsRead } = useMarkAsRead(String(conversation.id));
   
-  // 状态
-  const [messages, setMessages] = useState<MessageResponse[]>([]);
+  // 状态 - 使用 Zustand selector 直接订阅消息
+  const messages = useMessageStore(state => state.messagesMap.get(String(conversation.id)) || []);
   const [loading, setLoading] = useState(true);
   const [sending, setSending] = useState(false);
   const [inputText, setInputText] = useState('');
@@ -490,7 +490,6 @@ export const EmbeddedChat: React.FC<EmbeddedChatProps> = ({ conversation, onBack
     try {
       setLoading(true);
       await messageManager.fetchMessages(String(conversation.id));
-      setMessages(messageManager.getMessages(String(conversation.id)));
     } catch (error: any) {
       // 检查是否是权限错误或会话不存在错误
       const errorMessage = error?.message || String(error);
@@ -501,8 +500,6 @@ export const EmbeddedChat: React.FC<EmbeddedChatProps> = ({ conversation, onBack
         error?.code === 'FORBIDDEN'
       ) {
         console.warn('[EmbeddedChat] 会话不存在或无权限访问:', conversation.id);
-        // 设置空消息列表，让 UI 显示"暂无消息"而不是崩溃
-        setMessages([]);
       } else {
         console.error('[EmbeddedChat] 加载消息失败:', error);
       }
@@ -514,25 +511,6 @@ export const EmbeddedChat: React.FC<EmbeddedChatProps> = ({ conversation, onBack
   // 初始加载
   useEffect(() => {
     loadMessages();
-    
-    // 订阅消息事件
-    const subscriber: MessageSubscriber = (event: MessageEvent) => {
-      if (
-        event.type === 'messages_updated' &&
-        String(event.payload?.conversationId) === String(conversation.id)
-      ) {
-        setMessages(event.payload.messages || []);
-        setTimeout(() => {
-          flatListRef.current?.scrollToEnd({ animated: true });
-        }, 100);
-      }
-    };
-    
-    const unsubscribe = messageManager.subscribe(subscriber);
-    
-    return () => {
-      unsubscribe();
-    };
   }, [conversation.id, loadMessages]);
   
   // 自动标记已读 - 当有新消息时