feat: 基础信息叠板计算功能

- 新增 StackCountCalculator: 数字化规则表（短槽刀/EA刀10×4、槽刀10×4、钻针10×6），公开Calculate方法，输入校验，查表逻辑，16oz铜厚递减
- 新增 StartupSelectionViewModel: 替换匿名DataContext，保留所有显示属性，新增板厚/铜厚输入、计算结果/明细、CanCalculate
- 新增 NonEmptyToVisibilityConverter
- 修改 StartupSelectionWindow.xaml: 增宽680px，新增3行（输入+结果+明细），计算按钮在基础信息内部
- 修改 StartupSelectionWindow.xaml.cs: 构造函数接收ViewModel，新增计算按钮事件
- 修改 App.xaml.cs: 构建ViewModel实例，CalculateStackMinDiameters独立遍历Tools（含0.749mm，排除机台码）
- 修改 App.xaml: 注册NonEmptyToVisibilityConverter

StartupSelectionWindow.xaml.cs

@@ -1,4 +1,3 @@
-using System.IO;
 using System.Windows;
 
 namespace DrillTools
@@ -17,26 +16,12 @@ 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)
+        public StartupSelectionWindow(StartupSelectionViewModel viewModel,
+            bool canClearParameters = false, bool canGeneratePpDrillTape = false,
+            bool canScaleDrillTape = false)
         {
             InitializeComponent();
-            DataContext = new
-            {
-                FileName = Path.GetFileNameWithoutExtension(filePath),
-                MinDrillDiameter = minDrillDiameter,
-                MinSlotDiameter = minSlotDiameter,
-                MinEADiameter = minEADiameter,
-                IsPpDrillTape = isPpDrillTape,
-                PpXSpacing = ppXSpacing,
-                PpYSpacing = ppYSpacing,
-                HasOuter3175Spacing = hasOuter3175Spacing,
-                Outer3175XSpacing = outer3175XSpacing,
-                Outer3175YSpacing = outer3175YSpacing
-            };
+            DataContext = viewModel;
             ClearParametersButton.Visibility = canClearParameters ? Visibility.Visible : Visibility.Collapsed;
             GeneratePpDrillTapeButton.Visibility = canGeneratePpDrillTape ? Visibility.Visible : Visibility.Collapsed;
             ScaleDrillTapeButton.Visibility = canScaleDrillTape ? Visibility.Visible : Visibility.Collapsed;
@@ -71,5 +56,16 @@ namespace DrillTools
             SelectedAction = StartupAction.ScaleDrillTape;
             Close();
         }
+
+        /// <summary>
+        /// 计算叠板按钮点击事件
+        /// </summary>
+        private void CalculateStackCount_Click(object sender, RoutedEventArgs e)
+        {
+            if (DataContext is StartupSelectionViewModel vm)
+            {
+                vm.CalculateStackCount();
+            }
+        }
     }
 }