fix functional bugs

lib/domain/entities/client_subscription.dart

@@ -0,0 +1,24 @@
+import 'package:be_happy/domain/entities/subscription.dart';
+
+class ClientSubscription {
+  final int id;
+  final int subscriptionId;
+  final Subscription subscription;
+  final DateTime? expiredAt;
+
+  ClientSubscription({
+    required this.id,
+    required this.subscriptionId,
+    required this.subscription,
+    this.expiredAt,
+  });
+
+  factory ClientSubscription.fromJson(Map<String, dynamic> json) {
+    return ClientSubscription(
+      id: json['id'] ?? 0,
+      subscriptionId: json['subscriptionId'] ?? 0,
+      subscription: Subscription.fromJson(json['subscription'] as Map<String, dynamic>),
+      expiredAt: json['expiredAt'] != null ? DateTime.parse(json['expiredAt']) : null,
+    );
+  }
+}