修改锚点窗口对entry类的依赖，现在可以自行通过泛型扩展。

Runtime/VisualForm/SafeZoneEnums.cs

@@ -0,0 +1,29 @@
+using System;
+
+namespace XericUI.VisualForm
+{
+    /// <summary>
+    /// 安全区检测模式
+    /// </summary>
+    public enum SafeZoneMode
+    {
+        /// <summary>矩形安全区</summary>
+        Rect,
+        /// <summary>椭圆形安全区</summary>
+        Ellipse
+    }
+
+    /// <summary>
+    /// 窗口溢出状态（Flags枚举，支持位运算叠加）
+    /// </summary>
+    [Flags]
+    public enum OverflowState
+    {
+        /// <summary>在安全区范围内</summary>
+        InRange = 0,
+        /// <summary>超出安全区</summary>
+        OutOfSafeZone = 1 << 0,
+        /// <summary>超出屏幕</summary>
+        OutOfScreen = 1 << 1
+    }
+}