feat: 增加钻带涨缩功能，支持倍率/PPM模式缩放坐标

- 新增 ExcellonScaler 引擎：普通孔缩放坐标，G85槽孔保护槽长，刀具定义行原样保留
- 新增 DrillScalingWindow 参数设置窗口：倍率/PPM模式切换，X/Y独立输入
- 集成到启动功能菜单：.dr2/.dpin 文件显示"涨缩"按钮
- 输出覆盖原文件 + .bak 备份，GB2312 编码

StartupSelectionWindow.xaml.cs

@@ -9,7 +9,8 @@ namespace DrillTools
         AdjustToolOrder,
         ExportHoleCount,
         ClearParameters,
-        GeneratePpDrillTape
+        GeneratePpDrillTape,
+        ScaleDrillTape
     }
 
     public partial class StartupSelectionWindow : Window
@@ -17,6 +18,7 @@ namespace DrillTools
         public StartupAction SelectedAction { get; private set; } = StartupAction.None;
 
         public StartupSelectionWindow(string filePath, bool canClearParameters = false, bool canGeneratePpDrillTape = false,
+            bool canScaleDrillTape = false,
             double minDrillDiameter = 0, double minSlotDiameter = 0, double minEADiameter = 0,
             bool isPpDrillTape = false, double ppXSpacing = 0, double ppYSpacing = 0,
             bool hasOuter3175Spacing = false, double outer3175XSpacing = 0, double outer3175YSpacing = 0)
@@ -37,6 +39,7 @@ namespace DrillTools
             };
             ClearParametersButton.Visibility = canClearParameters ? Visibility.Visible : Visibility.Collapsed;
             GeneratePpDrillTapeButton.Visibility = canGeneratePpDrillTape ? Visibility.Visible : Visibility.Collapsed;
+            ScaleDrillTapeButton.Visibility = canScaleDrillTape ? Visibility.Visible : Visibility.Collapsed;
         }
 
         private void AdjustToolOrder_Click(object sender, RoutedEventArgs e)
@@ -62,5 +65,11 @@ namespace DrillTools
             SelectedAction = StartupAction.GeneratePpDrillTape;
             Close();
         }
+
+        private void ScaleDrillTape_Click(object sender, RoutedEventArgs e)
+        {
+            SelectedAction = StartupAction.ScaleDrillTape;
+            Close();
+        }
     }
 }