剖面盒导出添加 debug 日志：遍历耗时/对象数/隐藏数/导出耗时/文件大小

- ValidateAndTraverse: Models数量、遍历耗时、盒内对象数、隐藏节点数
- ExportTraversalToNwd: 导出开始参数、导出耗时、文件大小

src/Core/SectionBoxExporter.cs

@@ -42,6 +42,8 @@ namespace NavisworksTransport.Core
                 return result;
             }
 
+            LogManager.Debug($"[剖面盒导出] 开始验证剖面盒，Models={document.Models.Count}");
+
             var viewpoint = document.CurrentViewpoint.Value;
             var clipPlanes = viewpoint.ClipPlanes;
 
@@ -63,11 +65,16 @@ namespace NavisworksTransport.Core
                 return result;
             }
 
+            LogManager.Debug("[剖面盒导出] 开始遍历模型树...");
+            var sw = System.Diagnostics.Stopwatch.StartNew();
             var traversal = GetObjectsAndHiddenItems(document, bounds);
+            sw.Stop();
             _lastTraversal = traversal;
             result.ObjectCount = traversal.ObjectsInBox.Count;
             result.HiddenNodeCount = traversal.ItemsToHide.Count;
 
+            LogManager.Debug($"[剖面盒导出] 遍历完成: 耗时={sw.Elapsed.TotalSeconds:F1}s, 盒内对象={result.ObjectCount}, 隐藏节点={result.HiddenNodeCount}");
+
             if (traversal.ObjectsInBox.Count == 0)
             {
                 result.ErrorMessage = "剖面盒内没有找到对象！";
@@ -94,6 +101,9 @@ namespace NavisworksTransport.Core
             result.ObjectCount = _lastTraversal.ObjectsInBox.Count;
             result.HiddenNodeCount = _lastTraversal.ItemsToHide.Count;
 
+            LogManager.Debug($"[剖面盒导出] 开始导出: 对象={result.ObjectCount}, 隐藏={result.HiddenNodeCount}, 路径={filePath}");
+            var sw = System.Diagnostics.Stopwatch.StartNew();
+
             LogManager.Info($"[SectionBoxExporter] 剖面盒内找到 {result.ObjectCount} 个对象，可隐藏 {result.HiddenNodeCount} 个节点");
 
             try
@@ -113,6 +123,8 @@ namespace NavisworksTransport.Core
                 result.Success = true;
                 result.FilePath = exportedPath;
                 result.FileSize = new FileInfo(exportedPath).Length;
+                sw.Stop();
+                LogManager.Debug($"[剖面盒导出] 完成: 耗时={sw.Elapsed.TotalSeconds:F1}s, 文件大小={result.FileSize / 1024} KB");
             }
             catch (Exception ex)
             {