fix

Service/ImportService.cs

@@ -341,7 +341,7 @@ public class ImportService(
             }
 
             // 使用正则表达式提取退款金额
-            var regex = new System.Text.RegularExpressions.Regex(@"￥(-?\d+(\.\d+)?)");
+            var regex = new Regex(@"￥(-?\d+(\.\d+)?)");
             var match = regex.Match(status);
             if (match.Success && decimal.TryParse(match.Groups[1].Value, out var refundAmount))
             {