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/HomeScreen.tsx

@@ -88,6 +88,10 @@ export const HomeScreen: React.FC = () => {
   // 用于跟踪当前页面显示的帖子 ID，以便从 store 同步状态
   const postIdsRef = useRef<Set<string>>(new Set());
   const lastSwipeAtRef = useRef(0);
+  
+  // 网格模式滚动位置检测
+  const gridScrollYRef = useRef(0);
+  const isLoadingMoreRef = useRef(false);
 
   // 构建一个以 postId 为 key 的 map，用于快速查找
   const postsMap = useMemo(() => {
@@ -131,14 +135,30 @@ export const HomeScreen: React.FC = () => {
 
   // 加载更多方法
   const loadMore = useCallback(async () => {
-    if (hasMore && !isLoading) {
+    if (hasMore && !isLoading && !isLoadingMoreRef.current) {
+      isLoadingMoreRef.current = true;
       try {
         await processPostUseCase.loadMorePosts(listKey);
       } catch (err) {
         console.error('加载更多失败:', err);
+      } finally {
+        isLoadingMoreRef.current = false;
       }
     }
   }, [listKey, hasMore, isLoading]);
+  
+  // 网格模式滚动处理 - 检测是否滚动到底部
+  const handleGridScroll = useCallback((event: any) => {
+    const { layoutMeasurement, contentOffset, contentSize } = event.nativeEvent;
+    const scrollY = contentOffset.y;
+    const visibleHeight = layoutMeasurement.height;
+    const contentHeight = contentSize.height;
+    
+    // 当滚动到距离底部 200px 时触发加载更多
+    if (scrollY + visibleHeight >= contentHeight - 200) {
+      loadMore();
+    }
+  }, [loadMore]);
 
   // 刷新方法 - 先获取正确类型的帖子，再刷新
   const refresh = useCallback(async () => {
@@ -485,6 +505,7 @@ export const HomeScreen: React.FC = () => {
           ]}
           showsVerticalScrollIndicator={false}
           scrollEventThrottle={100}
+          onScroll={handleGridScroll}
           refreshControl={
             <RefreshControl
               refreshing={isRefreshing}
@@ -495,6 +516,12 @@ export const HomeScreen: React.FC = () => {
           }
         >
           {distributePostsToColumns.map((column, index) => renderWaterfallColumn(column, index))}
+          {/* 加载更多指示器 */}
+          {isLoading && displayPosts.length > 0 && (
+            <View style={styles.loadingMore}>
+              <Loading size="sm" />
+            </View>
+          )}
         </ScrollView>
       );
     }
@@ -767,4 +794,9 @@ const styles = StyleSheet.create({
     height: 72,
     borderRadius: 36,
   },
+  loadingMore: {
+    paddingVertical: 20,
+    alignItems: 'center',
+    justifyContent: 'center',
+  },
 });