释放碰撞的COM API内存

src/Core/Collision/ClashDetectiveIntegration.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Runtime.InteropServices;
 using System.Text;
 using Autodesk.Navisworks.Api;
 using Autodesk.Navisworks.Api.Clash;
@@ -1737,10 +1738,21 @@ namespace NavisworksTransport
                 }
                 
                 // 清理引用，防止内存泄漏
+                if (_clashElement != null)
+                {
+                    try
+                    {
+                        Marshal.ReleaseComObject(_clashElement);
+                    }
+                    catch (Exception comEx)
+                    {
+                        LogManager.Warning($"释放Clash Element COM对象失败: {comEx.Message}");
+                    }
+                }
                 _clashElement = null;
                 _dynamicClashTest = null;
                 _documentClash = null;
-                _state = null;
+                _state = null; // 不释放，这是全局单例
                 
                 _isInitialized = false;