feat: decentralized registries and mirrors

[Aslemammad]

This is a pull request for my two months of research on how we can decentralize npm by not breaking any mainstream behavior, so we make it as easy as possible to adopt new paradigms by users without having to deal with new conventions or at least a inconvenient number of them.

I'm still working on the description and this is just a filler description, so bear with me.

THIS PR IS EXTREMELY WIP AND IT'S THERE TO DEMONSTRATE IDEAS.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
docs.npmx.dev	Ready	Preview, Comment	Apr 5, 2026 4:49am
npmx.dev	Ready	Preview, Comment	Apr 5, 2026 4:49am

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
npmx-lunaria	Ignored		Apr 5, 2026 4:49am

[github-actions]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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