fix: 修复gitignore忽略问题

[bjmhe]

这个文件，本地开发是直接复制到新文件夹 docs 下，所以构建没问题。但是提交的时候，由于gitignore设置了vitepress，所以没提交成功 本次改动修复了gitignore，并且还原了丢失的内容

[bjmhe]

@robinv8 review please

[Copilot]

Pull request overview

This PR adjusts the repository’s .gitignore so the docs’ .vitepress source directory (config/theme) is no longer unintentionally ignored, and introduces a custom VitePress configuration/theme to support the documentation site (including an embedded H5 demo iframe and an IconList component).

Changes:

• Update .gitignore to ignore only VitePress build artifacts (.vitepress/cache, .vitepress/dist) instead of the entire .vitepress/ directory.
• Add VitePress site config (docs/.vitepress/config.mts) including a dev-server middleware to serve the H5 demo build from examples/demo/dist.
• Add a custom VitePress theme (CSS, Layout with iframe demo, global IconList component).

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
docs/.vitepress/theme/style.css	Adds VitePress brand tokens and doc/demo-specific styling (icon list, resource cards, iframe wrapper, changelog timeline).
docs/.vitepress/theme/Layout.vue	Custom layout that conditionally embeds the H5 demo in an iframe on component docs pages.
docs/.vitepress/theme/index.ts	Registers the custom theme assets and globally registers IconList.
docs/.vitepress/theme/components/IconList.vue	New Vue version of the icon list renderer used by docs.
docs/.vitepress/config.mts	VitePress config (base/nav/sidebar/etc.) plus a dev middleware to serve /h5/ assets from examples/demo/dist.
.gitignore	Stops ignoring the whole .vitepress/ directory; ignores only cache/dist outputs.

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