implemented backend wallet service connection

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

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+import 'package:json_annotation/json_annotation.dart';
+
+part 'asset.g.dart';
+
+
+@JsonSerializable()
+class WalletAssetDTO {
+  final String chain;
+  final String tokenSymbol;
+  final String contractAddress;
+
+  const WalletAssetDTO({
+    required this.chain,
+    required this.tokenSymbol,
+    required this.contractAddress,
+  });
+
+  factory WalletAssetDTO.fromJson(Map<String, dynamic> json) => _$WalletAssetDTOFromJson(json);
+  Map<String, dynamic> toJson() => _$WalletAssetDTOToJson(this);
+}

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

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+import 'package:json_annotation/json_annotation.dart';
+
+import 'package:pshared/data/dto/wallet/money.dart';
+
+part 'balance.g.dart';
+
+
+@JsonSerializable()
+class WalletBalanceDTO {
+  final MoneyDTO? available;
+  final MoneyDTO? pendingInbound;
+  final MoneyDTO? pendingOutbound;
+  final String? calculatedAt;
+
+  const WalletBalanceDTO({
+    required this.available,
+    required this.pendingInbound,
+    required this.pendingOutbound,
+    required this.calculatedAt,
+  });
+
+  factory WalletBalanceDTO.fromJson(Map<String, dynamic> json) => _$WalletBalanceDTOFromJson(json);
+  Map<String, dynamic> toJson() => _$WalletBalanceDTOToJson(this);
+}

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

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+import 'package:json_annotation/json_annotation.dart';
+
+part 'money.g.dart';
+
+
+@JsonSerializable()
+class MoneyDTO {
+  final String amount;
+  final String currency;
+
+  const MoneyDTO({
+    required this.amount,
+    required this.currency,
+  });
+
+  factory MoneyDTO.fromJson(Map<String, dynamic> json) => _$MoneyDTOFromJson(json);
+  Map<String, dynamic> toJson() => _$MoneyDTOToJson(this);
+}

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

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+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);
+}