🐛[BUG] Proform 的readonly对 checkbox 不起作用

### 🐛 bug 描述

### 📷 复现步骤

https://codesandbox.io/p/sandbox/awesome-cori-sgtjfc

### 🏞 期望结果

单个checkbox也可以设置readonly

### 💻 复现代码

[codesandbox](https://codesandbox.io/p/sandbox/awesome-cori-sgtjfc)

### © 版本信息

- ProComponents 版本: [2.7.16]
- umi 版本
- 浏览器环境 [chrome]
- 开发环境 [mac OS]

Start by running the linked CodeSandbox reproduction with ProComponents 2.7.16 in Chrome. Verify the behavior of a single ProForm checkbox configured as readonly, then identify the relevant component entry point from the reproduction; done means the checkbox honors readonly while preserving the expected behavior.

Written by the indexing model from the issue text.