Feishin's first-login flow hits getUser to discover the authenticated
identity's roles. We never registered the route, so chi returned a
plain-text 404 — Feishin's parser treats anything non-Subsonic as a
generic auth failure ("Failed to log in"), masking the real cause.
- Implement /rest/getUser with the full role bag. Admins get every
role; non-admins get the play-music subset. Single-user M1 means
cross-user lookups by admins return the caller's roles for now;
revisit when user management lands.
- Set sub.NotFound on /rest/* to emit a Subsonic envelope (code 0,
"Method not implemented") instead of plain text. Any future client
probing an unimplemented endpoint now sees a parseable failure.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
