felis api wired the hasJoined multiplexer only when felis.toml had at
least one [[auth_source]]. With none, the source list stayed nil and
every hasJoined answer was a 204. That was harmless while nothing
pointed at the route, but the installer now starts Velocity with
-Dmojang.sessionserver aimed at felis-api unconditionally, and the
generated felis.toml tells the operator to delete the LittleSkin block
for a Mojang-only server. Doing exactly that turned every login away,
premium accounts included, and felis-api logged nothing about it.
Always build the list through authSourcesFromConfig, which prepends
Mojang in code, so an empty config is a Mojang-only relay. felis nano
already behaves this way with the same file.
The new test pins authSourcesFromConfig itself: Mojang first, the only
Identity source, and still present when nothing is configured. Marking
a configured source Identity makes it fail. The call site in cmdAPI is
now a single unconditional assignment and has no unit test of its own.
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