(improvement)(Headless) Refactor service package of Headless-Server module (#1228)

Co-authored-by: lxwcodemonkey

headless/api/src/main/java/com/tencent/supersonic/headless/api/pojo/response/ItemResp.java

@@ -30,4 +30,8 @@ public class ItemResp {
         this.type = type;
     }
 
+    public boolean isRoot() {
+        return parentId == null || parentId == 0;
+    }
+
 }