auth.setup only wrote the web password hash to user.json, so the
archipelago system user kept the image default password ("archipelago")
on console/SSH even after the user picked a real password during
onboarding. Reuse the existing usermod-based sync (already used by
auth.changePassword's alsoChangeSsh path) at setup time, best-effort so
a failure can never break onboarding.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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