refactor(message): simplify state management and remove redundant service methods

Refactor the message module to streamline state management by removing the `MessageStateManager` and `SubscriptionManager` layers, relying instead on Zustand's built-in selector mechanism for reactive updates.

- Remove redundant `setConversations`, `addMessage`, and `updateMessage` actions from the Zustand store to favor more specialized update methods.
- Clean up `MessageService` by removing deprecated conversation and message sending convenience methods.
- Update service interfaces to support new synchronization capabilities including `syncBySeq` and `restartSources`.
- Simplify documentation and comments across the message store and its associated services.

src/stores/message/store.ts

@@ -1,11 +1,6 @@
 /**
  * 消息状态 Zustand Store
  * 使用 zustand 进行状态管理，提供响应式状态更新
- *
- * 重构说明：
- * - 移除了 MessageStateManager 包装层
- * - 直接使用 zustand store 进行状态管理
- * - 移除了 SubscriptionManager，改用 Zustand selector 进行响应式订阅
  */
 
 import { create } from 'zustand';
@@ -78,7 +73,6 @@ export interface MessageActions {
   isNotificationMuted: (conversationId: string) => boolean;
 
   // 设置状态
-  setConversations: (conversations: Map<string, ConversationResponse>) => void;
   setConversationsWithUnread: (
     conversations: Map<string, ConversationResponse>,
     totalUnread: number,
@@ -87,8 +81,6 @@ export interface MessageActions {
   updateConversation: (conversation: ConversationResponse) => void;
   removeConversation: (conversationId: string) => void;
   setMessages: (conversationId: string, messages: MessageResponse[]) => void;
-  addMessage: (conversationId: string, message: MessageResponse) => void;
-  updateMessage: (conversationId: string, messageId: string, updates: Partial<MessageResponse>) => void;
   setUnreadCount: (total: number, system: number) => void;
   setLastSystemMessageAt: (time: string | null) => void;
   setSSEConnected: (connected: boolean) => void;
@@ -253,21 +245,6 @@ export const useMessageStore = create<MessageStore>((set, get) => ({
 
   // ==================== 设置状态 ====================
 
-  setConversations: (conversations: Map<string, ConversationResponse>) => {
-    const conversationList = sortConversationList(conversations);
-    const notificationMutedMap = new Map<string, boolean>();
-    conversations.forEach((conv, id) => {
-      if (conv.notification_muted) {
-        notificationMutedMap.set(id, true);
-      }
-    });
-    set(state => ({
-      conversations,
-      conversationList,
-      notificationMutedMap: new Map([...state.notificationMutedMap, ...notificationMutedMap]),
-    }));
-  },
-
   setConversationsWithUnread: (
     conversations: Map<string, ConversationResponse>,
     totalUnread: number,
@@ -348,39 +325,6 @@ export const useMessageStore = create<MessageStore>((set, get) => ({
     });
   },
 
-  addMessage: (conversationId: string, message: MessageResponse) => {
-    const normalizedId = normalizeConversationId(conversationId);
-    set(state => {
-      const existing = state.messagesMap.get(normalizedId) || [];
-      const exists = existing.some(m => String(m.id) === String(message.id));
-
-      if (exists) {
-        return state;
-      }
-
-      const updated = mergeMessagesById(existing, [message]);
-      const newMessagesMap = new Map(state.messagesMap);
-      newMessagesMap.set(normalizedId, updated);
-      return { messagesMap: newMessagesMap };
-    });
-  },
-
-  updateMessage: (conversationId: string, messageId: string, updates: Partial<MessageResponse>) => {
-    const normalizedId = normalizeConversationId(conversationId);
-    set(state => {
-      const messages = state.messagesMap.get(normalizedId);
-      if (!messages) return state;
-
-      const updated = messages.map(m =>
-        String(m.id) === String(messageId) ? { ...m, ...updates } : m
-      );
-
-      const newMessagesMap = new Map(state.messagesMap);
-      newMessagesMap.set(normalizedId, updated);
-      return { messagesMap: newMessagesMap };
-    });
-  },
-
   setUnreadCount: (total: number, system: number) => {
     set({ totalUnreadCount: total, systemUnreadCount: system });
   },