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/groupService.ts

@@ -23,6 +23,8 @@ import {
   MyMemberInfoResponse,
   SetGroupAvatarRequest,
   HandleGroupRequestAction,
+  CursorPaginationRequest,
+  CursorPaginationResponse,
 } from '../types/dto';
 
 // 群组服务类（纯 API 层）
@@ -321,6 +323,86 @@ class GroupService {
     );
   }
 
+  // ==================== 游标分页方法 ====================
+
+  /**
+   * 获取群组列表（游标分页）
+   * GET /api/v1/groups/cursor
+   * @param params 游标分页请求参数
+   */
+  async getGroupsCursor(
+    params: CursorPaginationRequest = {}
+  ): Promise<CursorPaginationResponse<GroupResponse>> {
+    try {
+      const response = await api.get<CursorPaginationResponse<GroupResponse>>('/groups/cursor', {
+        params,
+      });
+      return response.data;
+    } catch (error) {
+      console.error('获取群组列表失败:', error);
+      return {
+        items: [],
+        next_cursor: null,
+        prev_cursor: null,
+        has_more: false,
+      };
+    }
+  }
+
+  /**
+   * 获取群组成员列表（游标分页）
+   * GET /api/v1/groups/:id/members/cursor
+   * @param groupId 群组ID
+   * @param params 游标分页请求参数
+   */
+  async getGroupMembersCursor(
+    groupId: number | string,
+    params: CursorPaginationRequest = {}
+  ): Promise<CursorPaginationResponse<GroupMemberResponse>> {
+    try {
+      const response = await api.get<CursorPaginationResponse<GroupMemberResponse>>(
+        `/groups/${encodeURIComponent(String(groupId))}/members/cursor`,
+        { params }
+      );
+      return response.data;
+    } catch (error) {
+      console.error('获取群组成员列表失败:', error);
+      return {
+        items: [],
+        next_cursor: null,
+        prev_cursor: null,
+        has_more: false,
+      };
+    }
+  }
+
+  /**
+   * 获取群公告列表（游标分页）
+   * GET /api/v1/groups/:id/announcements/cursor
+   * @param groupId 群组ID
+   * @param params 游标分页请求参数
+   */
+  async getGroupAnnouncementsCursor(
+    groupId: number | string,
+    params: CursorPaginationRequest = {}
+  ): Promise<CursorPaginationResponse<GroupAnnouncementResponse>> {
+    try {
+      const response = await api.get<CursorPaginationResponse<GroupAnnouncementResponse>>(
+        `/groups/${encodeURIComponent(String(groupId))}/announcements/cursor`,
+        { params }
+      );
+      return response.data;
+    } catch (error) {
+      console.error('获取群公告列表失败:', error);
+      return {
+        items: [],
+        next_cursor: null,
+        prev_cursor: null,
+        has_more: false,
+      };
+    }
+  }
+
   // ==================== 兼容旧API的方法（将逐步废弃） ====================
 
   /**