implemented backend wallet service connection

frontend/pweb/lib/data/mappers/wallet_ui.dart

@@ -0,0 +1,26 @@
+import 'package:pshared/models/wallet/wallet.dart' as domain;
+
+import 'package:pweb/models/currency.dart';
+import 'package:pweb/models/wallet.dart';
+
+
+extension WalletUiMapper on domain.WalletModel {
+  Wallet toUi() {
+    final amountStr = availableMoney?.amount ?? balance?.available?.amount ?? '0';
+    final currencyStr = availableMoney?.currency ?? balance?.available?.currency ?? Currency.usd.toString().toUpperCase();
+    final parsedAmount = double.tryParse(amountStr) ?? 0;
+    final currency = Currency.values.firstWhere(
+      (c) => c.name.toUpperCase() == currencyStr.toUpperCase(),
+      orElse: () => Currency.usd,
+    );
+    return Wallet(
+      id: walletRef,
+      walletUserID: walletRef,
+      name: metadata?['name'] ?? walletRef,
+      balance: parsedAmount,
+      currency: currency,
+      isHidden: true,
+      calculatedAt: balance?.calculatedAt ?? DateTime.now(),
+    );
+  }
+}