更新 README 文档，修正截图标题并添加第二张截图；在 JsonTreeNode 组件中添加注释以提高代码可读性

README.md

@@ -106,9 +106,10 @@ npm run preview
 - 当 `excludeIfEmpty = true` 时，空值字段不会出现在输出 JSON 中
 - 若目标字段包含 `.`，会按路径写入嵌套对象
 
-## <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͼ
 
-![<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͼ 1](doc/images/image1.png)
+## Screenshots
 
-![<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͼ 2](doc/images/image2.png)
+![Screenshot 1](doc/images/image1.png)
+
+![Screenshot 2](doc/images/image2.png)