implemented backend wallet service connection

frontend/pshared/lib/models/wallet/wallet.dart

@@ -0,0 +1,62 @@
+import 'package:pshared/models/wallet/balance.dart';
+import 'package:pshared/models/wallet/money.dart';
+
+
+class WalletAsset {
+  final String chain;
+  final String tokenSymbol;
+  final String contractAddress;
+
+  const WalletAsset({
+    required this.chain,
+    required this.tokenSymbol,
+    required this.contractAddress,
+  });
+}
+
+class WalletModel {
+  final String walletRef;
+  final String organizationRef;
+  final String ownerRef;
+  final WalletAsset asset;
+  final String depositAddress;
+  final String status;
+  final Map<String, String>? metadata;
+  final DateTime? createdAt;
+  final DateTime? updatedAt;
+  final WalletBalance? balance;
+  final WalletMoney? availableMoney;
+
+  const WalletModel({
+    required this.walletRef,
+    required this.organizationRef,
+    required this.ownerRef,
+    required this.asset,
+    required this.depositAddress,
+    required this.status,
+    this.metadata,
+    this.createdAt,
+    this.updatedAt,
+    this.balance,
+    this.availableMoney,
+  });
+
+  WalletModel copyWith({
+    WalletBalance? balance,
+    WalletMoney? availableMoney,
+  }) {
+    return WalletModel(
+      walletRef: walletRef,
+      organizationRef: organizationRef,
+      ownerRef: ownerRef,
+      asset: asset,
+      depositAddress: depositAddress,
+      status: status,
+      metadata: metadata,
+      createdAt: createdAt,
+      updatedAt: updatedAt,
+      balance: balance ?? this.balance,
+      availableMoney: availableMoney ?? this.availableMoney,
+    );
+  }
+}