Add WebUI API token authorization

[mintyleaf]

Description

This PR fixes #2227 (tracked in #2156) I've added a simple (we can't use fancy template resources without auth) html login page for token input, which pushes xhr request to the new /login handler, which is sets a 24hr valid cookie for a token. The v2keyauth is now looking for token field in cookies too.

Notes for Reviewers

Signed commits

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[mudler]

This is looking nice, thank you! just few small nits