feat(pagination): implement cursor-based pagination across the app

Add useCursorPagination hook and update multiple screens and services
to use cursor-based pagination for better performance and consistency.

- Add useCursorPagination hook with deduplication and caching support
- Add cursor pagination types to infrastructure layer
- Refactor HomeScreen, PostDetailScreen, SearchScreen for posts/comments
- Refactor GroupMembersScreen, JoinGroupScreen for groups/members
- Refactor MessageListScreen, NotificationsScreen for messages
- Update post, message, group, comment, notification services with cursor endpoints
- Add CursorPaginationRequest/Response DTOs
- Remove deprecated OPTIMIZATION_DESIGN.md documentation

src/services/messageService.ts

@@ -15,8 +15,11 @@ import {
   UnreadCountResponse,
   ConversationUnreadCountResponse,
   SystemMessageListResponse,
+  SystemMessageResponse,
   SystemUnreadCountResponse,
   MessageSegment,
+  CursorPaginationRequest,
+  CursorPaginationResponse,
 } from '../types/dto';
 import {
   getConversationCache,
@@ -555,6 +558,85 @@ class MessageService {
     await api.put('/messages/system/read-all');
   }
 
+  // ==================== 游标分页方法 ====================
+
+  /**
+   * 获取会话列表（游标分页）
+   * GET /api/v1/conversations/cursor
+   * @param params 游标分页请求参数
+   */
+  async getConversationsCursor(
+    params: CursorPaginationRequest = {}
+  ): Promise<CursorPaginationResponse<ConversationResponse>> {
+    try {
+      const response = await api.get<CursorPaginationResponse<ConversationResponse>>(
+        '/conversations/cursor',
+        { params }
+      );
+      return response.data;
+    } catch (error) {
+      console.error('获取会话列表失败:', error);
+      return {
+        items: [],
+        next_cursor: null,
+        prev_cursor: null,
+        has_more: false,
+      };
+    }
+  }
+
+  /**
+   * 获取消息列表（游标分页）
+   * GET /api/v1/conversations/:id/messages/cursor
+   * @param conversationId 会话ID
+   * @param params 游标分页请求参数
+   */
+  async getMessagesCursor(
+    conversationId: string,
+    params: CursorPaginationRequest = {}
+  ): Promise<CursorPaginationResponse<MessageResponse>> {
+    try {
+      const response = await api.get<CursorPaginationResponse<MessageResponse>>(
+        `/conversations/${encodeURIComponent(conversationId)}/messages/cursor`,
+        { params }
+      );
+      return response.data;
+    } catch (error) {
+      console.error('获取消息列表失败:', error);
+      return {
+        items: [],
+        next_cursor: null,
+        prev_cursor: null,
+        has_more: false,
+      };
+    }
+  }
+
+  /**
+   * 获取系统消息列表（游标分页）
+   * GET /api/v1/messages/system/cursor
+   * @param params 游标分页请求参数
+   */
+  async getSystemMessagesCursor(
+    params: CursorPaginationRequest = {}
+  ): Promise<CursorPaginationResponse<SystemMessageResponse>> {
+    try {
+      const response = await api.get<CursorPaginationResponse<SystemMessageResponse>>(
+        '/messages/system/cursor',
+        { params }
+      );
+      return response.data;
+    } catch (error) {
+      console.error('获取系统消息列表失败:', error);
+      return {
+        items: [],
+        next_cursor: null,
+        prev_cursor: null,
+        has_more: false,
+      };
+    }
+  }
+
   // ==================== 兼容旧API的方法（将逐步废弃） ====================
 
   /**