refactor: standardize pagination response structure and enhance cursor handling

- Update various services and hooks to replace 'items' with 'list' for consistency in pagination responses.
- Modify PostRepository, commentService, groupService, messageService, and postService to align with the new response structure.
- Enhance cursor pagination logic in hooks and components to ensure proper handling of pagination states.
- Refactor HomeScreen, PostDetailScreen, SearchScreen, and other components to utilize the updated pagination structure.

src/screens/home/PostDetailScreen.tsx

@@ -72,7 +72,7 @@ export const PostDetailScreen: React.FC = () => {
   
   // 使用游标分页 Hook 管理评论列表
   const {
-    items: paginatedComments,
+    list: paginatedComments,
     isLoading: isCommentsLoading,
     isRefreshing: isCommentsRefreshing,
     hasMore: hasMoreComments,
@@ -206,13 +206,13 @@ export const PostDetailScreen: React.FC = () => {
 
   // 如果是从评论按钮跳转过来的，加载完成后滚动到评论区
   useEffect(() => {
-    if (shouldScrollToComments && !loading && comments.length > 0) {
+    if (shouldScrollToComments && !loading && (comments?.length ?? 0) > 0) {
       // 延迟确保列表已完成渲染和布局
       setTimeout(() => {
         flatListRef.current?.scrollToIndex({ index: 0, animated: true, viewPosition: 0 });
       }, 500);
     }
-  }, [shouldScrollToComments, loading, comments.length]);
+  }, [shouldScrollToComments, loading, comments?.length]);
 
   // 动态设置导航头部
   useEffect(() => {
@@ -1413,7 +1413,7 @@ export const PostDetailScreen: React.FC = () => {
               加载更多评论
             </Text>
           </TouchableOpacity>
-        ) : comments.length > 0 ? (
+        ) : (comments?.length ?? 0) > 0 ? (
           <Text variant="caption" color={colors.text.hint} style={styles.noMoreComments}>
             没有更多评论了
           </Text>
@@ -1546,7 +1546,7 @@ export const PostDetailScreen: React.FC = () => {
                   加载更多评论
                 </Text>
               </TouchableOpacity>
-            ) : comments.length > 0 ? (
+            ) : (comments?.length ?? 0) > 0 ? (
               <Text variant="caption" color={colors.text.hint} style={styles.noMoreComments}>
                 没有更多评论了
               </Text>