feat:增加回到顶部功能

lib/models/moment.dart

@@ -51,3 +51,24 @@ class Moment {
 
   Map<String, dynamic> toJson() => _$MomentToJson(this);
 }
+
+@JsonSerializable()
+class PageMoment {
+  final List<Moment> records;
+  final int total;
+  final int size;
+  final int current;
+  final int pages;
+
+  PageMoment({
+    required this.records,
+    required this.total,
+    required this.size,
+    required this.current,
+    required this.pages,
+  });
+
+  factory PageMoment.fromJson(Map<String, dynamic> json) => _$PageMomentFromJson(json);
+
+  Map<String, dynamic> toJson() => _$PageMomentToJson(this);
+}