feat: 添加货币格式化功能，更新多个控制器以支持金额和余额的格式化显示，增强 API 响应的可读性

app/Http/Controllers/Api/V1/Wallet/WalletBalanceController.php

@@ -9,6 +9,7 @@ use App\Support\ApiResponse;
 use Illuminate\Http\Request;
 use App\Support\CurrencyResolver;
 use Illuminate\Http\JsonResponse;
+use App\Support\CurrencyFormatter;
 use App\Http\Controllers\Controller;
 
 /**
@@ -53,14 +54,19 @@ final class WalletBalanceController extends Controller
 
         $balance = (int) $wallet->balance;
         $frozen = (int) $wallet->frozen_balance;
+        $available = max(0, $balance - $frozen);
 
         return ApiResponse::success([
             'balance' => $balance,
-            'available_balance' => max(0, $balance - $frozen),
+            'balance_formatted' => CurrencyFormatter::fromMinor($balance),
+            'available_balance' => $available,
+            'available_balance_formatted' => CurrencyFormatter::fromMinor($available),
             'main_balance' => null,
+            'main_balance_formatted' => null,
             'currency_code' => $wallet->currency_code,
             'wallet_type' => $wallet->wallet_type,
             'frozen_balance' => $frozen,
+            'frozen_balance_formatted' => CurrencyFormatter::fromMinor($frozen),
         ]);
     }