implemented backend wallet service connection

frontend/pshared/lib/data/dto/wallet/wallet.dart

@@ -0,0 +1,34 @@
+import 'package:json_annotation/json_annotation.dart';
+
+import 'package:pshared/data/dto/wallet/asset.dart';
+
+part 'wallet.g.dart';
+
+
+@JsonSerializable()
+class WalletDTO {
+  final String walletRef;
+  final String organizationRef;
+  final String ownerRef;
+  final WalletAssetDTO asset;
+  final String depositAddress;
+  final String status;
+  final Map<String, String>? metadata;
+  final String? createdAt;
+  final String? updatedAt;
+
+  const WalletDTO({
+    required this.walletRef,
+    required this.organizationRef,
+    required this.ownerRef,
+    required this.asset,
+    required this.depositAddress,
+    required this.status,
+    this.metadata,
+    this.createdAt,
+    this.updatedAt,
+  });
+
+  factory WalletDTO.fromJson(Map<String, dynamic> json) => _$WalletDTOFromJson(json);
+  Map<String, dynamic> toJson() => _$WalletDTOToJson(this);
+}