结构大修改，改成朴实无华的结构，不过度架构。能跑就行

Assets/Scripts/NBC/Asset/Editor/Utils/ImportTools.cs

@@ -0,0 +1,14 @@
+using UnityEditor;
+
+namespace NBC.Asset.Editor
+{
+    public class ImportAsset : AssetPostprocessor
+    {
+        private static void OnPostprocessAllAssets(string[] importedAssets, string[] deletedAssets,
+            string[] movedAssets,
+            string[] movedFromAssetPaths)
+        {
+            Builder.Gather();
+        }
+    }
+}