Operator-accepted deviation from 13-02 Task 3: the relay is structurally gone but /aiui/api/openrouter/ still answers 200 via the SPA catch-all. 13-09 already owns this nginx config, so the explicit return 404 belongs here rather than bolted onto a completed plan. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>