feat: add characters

lib/feature/profile/domain/entities/profile_entity.dart

@@ -22,6 +22,7 @@ class ProfileStats {
 class ProfileEntity {
   final String name;
   final String avatar;
+  final String avatarImg; // شخصیتِ آواتارِ انتخابی (<id>.<ext>؛ خالی ⇒ تصادفی)
   final String mobile;
   final int level;
   final int trophies;
@@ -35,6 +36,7 @@ class ProfileEntity {
   const ProfileEntity({
     required this.name,
     required this.avatar,
+    this.avatarImg = '',
     required this.mobile,
     required this.level,
     required this.trophies,