perf: Redis pub/sub, PgBouncer, optimistic UI for high concurrency
- Add Redis 7 for pub/sub (lobby + chat real-time), rate limiting, caching - Replace SSE DB polling with Redis pub/sub (lobby: instant approval, chat: instant delivery) - Add PgBouncer (transaction mode, 500 client → 25 pool connections) - Chat SSE stream via Redis pub/sub instead of 3s polling - Optimistic UI in ChatPanel (messages appear before server confirms) - Redis-based rate limiter (works across multiple app replicas) - Prisma query optimization (select only needed fields) - Chat message cache in Redis (10s TTL) - Docker Compose: add redis, pgbouncer services with healthchecks - Production: resource limits, 2 app replicas behind Traefik - Update CLAUDE.md, README.md, .env.example, setup.sh Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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