Add option to disable CSS preloading

[virtualzx-nad]

Original issue from vitejs/vite vitejs#19505

Currently, Vite automatically preloads CSS files, but there are cases where this behavior is not desired. We need to add an option to disable CSS preloading.

Requirements:

1. Add a configuration option to disable CSS preloading
2. Update the build process to respect this option
3. Document the new option in the configuration reference
4. Add tests to verify the behavior

This is a good first issue for someone familiar with Vite's build process.