feat: fav topic

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/models/user/fav_topic/page_info.dart

@@ -0,0 +1,16 @@
+class PageInfo {
+  int? curPageNum;
+  int? total;
+
+  PageInfo({this.curPageNum, this.total});
+
+  factory PageInfo.fromJson(Map<String, dynamic> json) => PageInfo(
+        curPageNum: json['cur_page_num'] as int?,
+        total: json['total'] as int?,
+      );
+
+  Map<String, dynamic> toJson() => {
+        'cur_page_num': curPageNum,
+        'total': total,
+      };
+}