v1.15.1: Zenos yae Galvus: Echo 1

[Xe]

Fixes a recurrence of CVE-2025-24369
due to an incorrect logic change in a refactor. This allows an attacker to mint a valid
access token by passing any SHA-256 hash instead of one that matches the proof-of-work
test.

This case has been added as a regression test. It was not when CVE-2025-24369 was released
due to the project not having the maturity required to enable this kind of regression testing.

If you use Anubis in Docker, pull the new :latest image or update your config to pull v1.15.1.

If you manually built Anubis, you will need to re-build for this patch. #156 is tracking proper binary packages.