feat:增加回到顶部功能

lib/api/moment.dart

@@ -21,6 +21,14 @@ Future<List<Moment>> queryMomentListApi() {
   );
 }
 
+Future<PageMoment> queryMomentByPageApi(int currentPage, int pageSize) {
+  return HttpUtil().get<PageMoment>(
+    "/moment/page",
+    queryParameters: {"currentPage": currentPage, "pageSize": pageSize},
+    converter: (data) => PageMoment.fromJson(data),
+  );
+}
+
 Future<bool> addMomentCommentApi(int id, String content) {
   return HttpUtil().post<bool>("/moment/$id/comment", data: content);
 }