feat: upower rank page

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

lib/models/upower_rank/level_info.dart

@@ -0,0 +1,22 @@
+class LevelInfo {
+  int? privilegeType;
+  String? name;
+  int? price;
+  int? memberTotal;
+
+  LevelInfo({this.privilegeType, this.name, this.price, this.memberTotal});
+
+  factory LevelInfo.fromJson(Map<String, dynamic> json) => LevelInfo(
+        privilegeType: json['privilege_type'] as int?,
+        name: json['name'] as String?,
+        price: json['price'] as int?,
+        memberTotal: json['member_total'] as int?,
+      );
+
+  Map<String, dynamic> toJson() => {
+        'privilege_type': privilegeType,
+        'name': name,
+        'price': price,
+        'member_total': memberTotal,
+      };
+}