refactor(overlay): move to script setup

[eiinu]

这个 PR 做了什么? (简要描述所做更改)

这个 PR 是什么类型? (至少选择一个)

• [ ] feat: 新特性提交
• [ ] fix: bug 修复
• [x] docs: 文档改进
• [ ] style: 组件样式/交互改进
• [x] type: 类型定义更新
• [ ] perf: 性能、包体积优化
• [x] refactor: 代码重构、代码风格优化
• [ ] test: 测试用例
• [ ] chore(deps): 依赖升级
• [ ] chore(demo): 演示代码改进
• [ ] chore(locale): 国际化改进
• [ ] chore: 其他改动（是关于什么的改动？）

这个 PR 涉及以下平台:

• [x] NutUI H5 @nutui/nutui
• [x] NutUI Taro @nutui/nutui-taro

这个 PR 是否已自测:

• [x] 自测 Vite 脚手架使用 测试仓库
• [x] 自测 Taro 脚手架使用小程序 & Taro-H5 测试仓库

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 83.94%. Comparing base (731780c) to head (56dbe29).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## v4 #3065 +/- ## ========================================== - Coverage 84.01% 83.94% -0.08% ========================================== Files 223 224 +1 Lines 23039 23018 -21 Branches 2485 2480 -5 ========================================== - Hits 19357 19323 -34 - Misses 3664 3677 +13 Partials 18 18 ```

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