Add TailwindCSS v4 as an option

[jscarle]

Please describe

Please add TailwindCSS as a an option!

Additional context

I know this has already been discussed as part of #246, but with the arrival of v4, it's even easier to integrate as an option now and should be reconsidered.

https://tailwindcss.com/docs/installation/using-vite

[btea]

It does seem very easy to introduce tailwind configuration now, perhaps relevant options can be added. cc @cexbrayat @haoqunjiang

[haoqunjiang]

I was uncertain how to test it since the CI matrix is already too large.
However, Tailwind is gaining so much popularity that it has now surpassed sass + sass-embedded: https://npmtrends.com/sass-vs-sass-embedded-vs-tailwindcss.

Since the boilerplate for Tailwind is different from sass and less, and it is not simply a matter of installing an additional dependency, I believe we should provide this option.

[jscarle]

I would love to contribute. I understand the implementation requirements of Tailwind CSS, but I'm not 100% sure where this would need to be implemented in this package. Perhaps you could give me a starting point?

[haoqunjiang]

1. Create a tailwind folder under template/config/ and add the necessary template files.
2. To modify the vite.config.ts/js, you need to use a vite.config.js.data.mjs like the one in the jsx template, the data will be later fed into an EJS template.
3. In index.ts, add the tailwind prompt to the FEATURE_OPTIONS array, and a tailwind CLI flag to the FEATURE_FLAGS array.
4. Translate the prompt into different languages if necessary (feel free to use AI) and modify the files under locales/ accordingly.
5. Add a render('config/tailwind') somewhere near

   create-vue/index.ts

   Line 396 in a7f6f72

   // Add configs.

6. To test your modifications, run pnpm build and node bundle.js in the project root.