riotpiao.com/tasks/5.7-api-chat.md

5.7 — POST /api/chat (mock, GREEN)

Phase: 5 — Chat + Rate Limiter (Surface D) Stage: GREEN

• POST /api/chat — SSE token stream

Done — implemented in app/api/chat/route.ts. Streams a canned reply through queue -> reasoning -> content -> done events. Mock only: no session, no Turnstile, no rate limiting, no real model. See REQUIREMENTS.md.