keyCache.Invalidate existed but had zero callers, and refresh silently
swallowed store errors — a revoked key kept working off the stale
cache for as long as the DB stayed down.
Invalidate now clears the key set (not just the timestamp) and is
wired through userInvalidatingStore, a decorator at the composition
root that drops the cache on AddUser/UpdateUser/DeleteUser/ImportData.
Transient refresh errors still retain the previous key set so a DB
blip can't lock every admin out, but a post-revocation refresh failure
denies. Refresh errors are logged. First tests for the SSH auth gate.
Also suppresses per-request HTTP logging when the local TUI owns the
terminal — request logs scribbled over the alt screen.
lerko
92efb8e270
