fix(time-picker): fix issue with read-only mode still being editable

[oljc]

Types of changes

• [ ] New feature
• [x] Bug fix
• [ ] Enhancement
• [ ] Component style change
• [ ] Typescript definition change
• [ ] Documentation change
• [ ] Coding style change
• [ ] Refactoring
• [ ] Test cases
• [ ] Continuous integration
• [ ] Breaking change
• [ ] Others

Background and context

readonly 不生效，只读模式点击输入框依然可以进行修改。

Solution

How is the change tested?

Changelog

Type	Component	Changelog(CN)	Changelog(EN)	Related issues
fix	time-picker	修复只读模式仍可编辑问题	Fix issue with read-only mode still being editable	Closed #3151
docs	time-picker	补充 placeholder 类型定义	Added placeholder type definition

Checklist:

• [x] Test suite passes (npm run test)
• [x] Provide changelog for relevant changes (e.g. bug fixes and new features) if applicable.
• [x] Changes are submitted to the appropriate branch (e.g. features should be submitted to feature branch and others should be submitted to main branch)

Other information

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