docs: update react guide

Author: fangsmile

docs/assets/guide/en/Developer_Ecology/react.md

@@ -63,6 +63,9 @@ Also note:
 - React 19 removes `react-dom.findDOMNode`. If a third-party component depends on it (older Popover/Trigger implementations), it will throw in React 19. Upgrade the UI library or replace the implementation.
   - Typical error: `findDOMNode is not a function`
 
+#### 4) React19 Demo 
+react 19 demo project: https://github.com/fangsmile/vtable-react19-demo-project
+
 ### Install
 
 #### Install using the package manager

docs/assets/guide/zh/Developer_Ecology/react.md

@@ -63,6 +63,9 @@ React-VTable 支持的“自定义单元格”常见有两种路径，概念上
 - React19 不支持 `react-dom.findDOMNode`，若第三方组件依赖它（例如旧版本 Popover/Trigger），会在 React19 下报错，需要升级组件库版本或替换实现
   - 典型报错：`findDOMNode is not a function`
 
+#### 4) React19 Demo 
+react 19的demo项目可访问：https://github.com/fangsmile/vtable-react19-demo-project
+
 ### 安装
 
 #### 使用包管理器安装