LocalFlowEnvironment文件丢失，需要重写

NodeFlow/Model/Node/SingleActionNode.cs

@@ -0,0 +1,18 @@
+using Serein.Library.Api;
+using Serein.Library;
+using System.Security.AccessControl;
+
+namespace Serein.NodeFlow.Model.Node
+{
+    /// <summary>
+    /// 单动作节点（用于动作控件)
+    /// </summary>
+    public class SingleActionNode : NodeModelBase
+    {
+        public SingleActionNode(IFlowEnvironment environment):base(environment)
+        {
+            
+        }
+
+    }
+}