What problem does this feature solve?

#2122 (comment)

The runtime component will increase the bundle size and will not be recorded in static data such as searchIndex.
it is out of the control of Rspress literally, they are advanced usages
So we can provide a Component with md syntax parsing at runtime just like <ReactMarkdown /> and <CodeBlockRuntime /> and clarify the difference from Rspress compile time
https://fumadocs.dev/docs/ui/components/dynamic-codeblock

What does the proposed API look like?

1. mdx parsing runtime component

a runtime component like react-markdown integrated with default remark plugins

https://github.com/web-infra-dev/rspress/blob/0a75ac2be9e54ee58a1555a0179e28efefc43f06/packages/plugin-api-docgen/static/global-components/API.tsx

2. code block parsing runtime component

<CodeBlockRuntime />