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

@@ -97,7 +97,8 @@
             <Button Width="120" Height="30" Content="调整刀序" Margin="0,0,15,0" Click="AdjustToolOrder_Click"/>
             <Button Width="120" Height="30" Content="导出孔数" Margin="0,0,15,0" Click="ExportHoleCount_Click"/>
             <Button Name="ClearParametersButton" Width="120" Height="30" Content="清空参数" Margin="0,0,15,0" Click="ClearParameters_Click"/>
-            <Button Name="GeneratePpDrillTapeButton" Width="120" Height="30" Content="生成PP钻带" Click="GeneratePpDrillTape_Click"/>
+            <Button Name="GeneratePpDrillTapeButton" Width="120" Height="30" Content="生成PP钻带" Margin="0,0,15,0" Click="GeneratePpDrillTape_Click"/>
+            <Button Name="ScaleDrillTapeButton" Width="120" Height="30" Content="涨缩" Click="ScaleDrillTape_Click"/>
         </StackPanel>
     </Grid>
 </Window>