重写了节点的view、viewmodel关系，实现了对画布元素的选取功能，重构了底层依赖，添加了对net .Framework4.6.1以上的Framework类库支持

Library.Core/Flow/Attribute.cs

@@ -0,0 +1,73 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Serein.Flow
+{
+
+    public enum DynamicNodeType
+    {
+        /// <summary>
+        /// 初始化
+        /// </summary>
+        Init,
+        /// <summary>
+        /// 开始载入
+        /// </summary>
+        Loading,
+        /// <summary>
+        /// 结束
+        /// </summary>
+        Exit,
+
+        /// <summary>
+        /// 触发器
+        /// </summary>
+        Flipflop,
+        /// <summary>
+        /// 条件节点
+        /// </summary>
+        Condition,
+        /// <summary>
+        /// 动作节点
+        /// </summary>
+        Action,
+    }
+
+
+
+    /// <summary>
+    /// 用来判断一个类是否需要注册并构建实例（单例模式场景使用）
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Class)]
+    public class DynamicFlowAttribute(bool scan = true) : Attribute
+    {
+        public bool Scan { get; set; } = scan;
+    }
+
+    /// <summary>
+    /// 标记一个方法是什么类型，加载dll后用来拖拽到画布中
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)]
+    public class MethodDetailAttribute(DynamicNodeType methodDynamicType,
+                                       string methodTips = "",
+                                       bool scan = true,
+                                       string lockName = "") : Attribute
+    {
+        public bool Scan { get; set; } = scan;
+        public string MethodTips { get; } = methodTips;
+        public DynamicNodeType MethodDynamicType { get; } = methodDynamicType;
+        public string LockName { get; } = lockName;
+    }
+
+    /// <summary>
+    /// 是否为显式参数
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Parameter)]
+    public class ExplicitAttribute : Attribute // where TEnum : Enum
+    {
+    }
+
+}