🐛[BUG]ProForm.useWatch无效

### 🐛 bug 描述

无法监听，字段改变不会重新渲染

### 📷 复现步骤

使用ProForm.useWatch监听一个字段变化

### 💻 复现代码

` const region = ProForm.useWatch('region', { form: formRef?.current });

useEffect(() => {
console.log(region);
}, [region]);`

Start by reproducing the issue with the provided ProForm.useWatch snippet and inspect the ProForm.useWatch implementation and its form subscription behavior. Done means changing the watched field causes the component to re-render and the effect to log the updated value.

Written by the indexing model from the issue text.