feat：改进部门模块

flyfish-data/src/main/java/com/flyfish/framework/domain/base/TreeDomain.java

@@ -18,6 +18,9 @@ public abstract class TreeDomain<T extends TreeDomain<T>> extends AuditDomain {
     // 深度，遍历标识
     private Integer depth;
 
+    // 是否是叶子节点
+    private Boolean leaf;
+
     // 冗余的字段，用来放儿子
     @Transient
     private List<T> children;