[Bug]: 在vite项目中引入@antv/g6后报错

### Describe the bug / 问题描述

在vite项目中引入@antv/g6后报错：Cannot read properties of undefined (reading 'Graph')
at node_modules/.pnpm/dagre@0.8.5/node_modules/dagre/lib/greedy-fas.js

```js
import { Graph } from '@antv/g6'
```

### Reproduction link / 复现链接

_No response_

### Steps to Reproduce the Bug or Issue / 重现步骤

_No response_

### Version / 版本

🆕 5.x

### OS / 操作系统

- [ ] macOS
- [x] Windows
- [ ] Linux
- [ ] Others / 其他

### Browser / 浏览器

- [x] Chrome
- [ ] Edge
- [ ] Firefox
- [ ] Safari (Limited support / 有限支持)
- [ ] IE (Nonsupport / 不支持)
- [ ] Others / 其他

Start by reproducing the Vite import shown in the issue, using the reported Windows and Chrome environment if possible. Read the stack trace through node_modules/.pnpm/dagre@0.8.5/node_modules/dagre/lib/greedy-fas.js and identify why importing Graph produces an undefined value. Done means the @antv/g6 import works in a Vite project without the reported Graph error.

Written by the indexing model from the issue text.