feat: 优化方法

als-common/common-core/src/main/java/org/eco/common/core/utils/TreeBuildUtils.java

@@ -28,7 +28,7 @@ public class TreeBuildUtils extends TreeUtil {
         if (CollUtil.isEmpty(list)) {
             return null;
         }
-        K k = ReflectUtils.invokeGetter(list.get(0), "parentId");
+        K k = ReflectUtils.invokeGetter(list.getFirst(), "parentId");
         return TreeUtil.build(list, k, DEFAULT_CONFIG, nodeParser);
     }