优化更新代码，添加界面功能并整合

WPFluent/Controls/SplashWindow/SplashConfig.cs

@@ -0,0 +1,10 @@
+using System.Windows;
+
+namespace WPFluent.Controls;
+
+public sealed class SplashConfig
+{
+    public static double ImageHeight { get; set; } = 300d;
+
+    public static CornerRadius CornerRadius { get; set; } = new CornerRadius(24d);
+}