Move vitest setup file to root

[silverwind]

I'm using this convention in other projects and I think it makes sense for gitea too because the vitest setup file is loaded globally for all tests, not just ones in web_src, so it makes sense to be in the root.

[wxiaoguang]

But the setup.js is for web_src only, it prepares something like window.config.

And oppositely personally I would prefer to move files away from the root directory, the root directory has been filled with a lot of various unrelated files already.

[silverwind]

Vitest can not do different setup files for different directories with a single config file. One would have to create multiple config files to achieve that. Thought, I do prefer such files to be in root because they are easy to find.

So, not sure how to proceed. I don't really want to move vitest.config.js out of root to leave the option open to test node scripts and to enable simple npx vitest utils commands working, thought I do see it not being optimal, jsdom environment being one of the reasons.

[silverwind]

Maybe we can compromise on web_src/js/vitest.setup.js, with such a location it's at least hierachically clear where the setup script applies.