资料归集，固定分类，显示文件夹

app/public/js/file_detail.js

@@ -28,13 +28,15 @@ $(document).ready(function() {
                 }
             });
             const sortNodes = this.dragTree.nodes.map(x => {
-                return {
+                const result = {
                     id: x.id,
                     tree_pid: x.tree_pid,
                     name: x.name + (x.total_file_count > 0 ? `(${x.total_file_count})` : ''),
                     spid: x.spid,
                     source_node: x,
                 };
+                if (result.source_node.is_fixed) result.isParent = true;
+                return result;
             });
             this.filingTree = $.fn.zTree.init($('#filing'), this.setting, sortNodes);
         }