[feat] If the debug server does not have a resource, display 404

[markH5]

Adding wrong path

+ ![img-1](/rspress-light-logo.png)
+ ![img-2](/rspress-light-logo.p_ng)
+ ![img-3](/rspress-light-logo.jpg)

dev mode show 200 OK

---

preview mode status 404 not find

duplicate https://github.com/markH5/rspress_dev_mode

If dev mode is used, it will generate clear warnings on chrome devtools, which I think is a good dx.

[SoonIter]

Rspress already provide this feature to check dead links
https://rspress.dev/api/config/config-build#markdowncheckdeadlinks

if you want to fix this issue that devServer has different behavior from prodServer, it is in the Rsbuild repo

https://github.com/web-infra-dev/rsbuild/blob/24dce750f74fcd1adaf062bc6f987061d7b058ea/packages/core/src/server/prodServer.ts#L163-L164

[markH5]

about check dead link:

In my projects, I commonly utilize dead links checks.
However, the provided minimal reproduction reveals that rspress fails to identify these links, both during the rspress build and rspress dev processes.

My temporary alternative, use <https://rsbuild.dev/guide/basic/static-assets#import-static-assets >

- ![img-1](/rspress-light-logo.png)
- ![img-2](/rspress-light-logo-2.png) // check dead link not match
- ![img-3](/rspress-light-logo-3.jpg) // also

+ import img4 from "../public/rspress-icon.png";
+ import img5 from "../public/rspress-icon5.png"; // has error   Compile error, i love it.

+ <img src={img4} />
+ <img src={img5} />

if you want to fix this issue that devServer has different behavior from prodServer, it is in the Rsbuild repo

Yes, that's what I really want, thanks for the guidance.