网格插件G6.Grid 不生效

### 问题描述

网格插件G6.Grid 不生效

### 重现链接

..

### 重现步骤

new G6.Grid();
new G6.TreeGraph({
...xxx,
plugins: [grid],
})

### 预期行为

展示画布网格

### 平台

- 操作系统: [macOS, Windows, Linux, React Native ...]
- 网页浏览器: [Google Chrome, Safari, Firefox]
- G6 版本: [4.5.1 ... ]

### 屏幕截图或视频（可选）

_No response_

### 补充说明（可选）

_No response_

Start by reproducing the issue with `new G6.Grid()` and a `G6.TreeGraph` configured with the grid plugin, using the reported G6 version if available. Compare the result with the expected behavior: the canvas should display a grid; the issue provides no file or test location, so first locate the grid plugin and TreeGraph entry points.

Written by the indexing model from the issue text.