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/Jackpot/JackpotSummaryController.php

@@ -6,6 +6,7 @@ use App\Models\JackpotPool;
 use App\Support\ApiResponse;
 use Illuminate\Http\Request;
 use Illuminate\Http\JsonResponse;
+use App\Support\CurrencyFormatter;
 use App\Http\Controllers\Controller;
 
 /**
@@ -25,10 +26,13 @@ final class JackpotSummaryController extends Controller
             ->where('status', 1)
             ->first();
 
+        $amountMinor = $pool !== null ? (int) $pool->current_amount : 0;
+
         return ApiResponse::success([
             'currency_code' => $currency,
             'enabled' => $pool !== null,
-            'current_amount_minor' => $pool !== null ? (int) $pool->current_amount : 0,
+            'current_amount_minor' => $amountMinor,
+            'current_amount_formatted' => CurrencyFormatter::fromMinor($amountMinor),
         ]);
     }
 }