feat: add HA infrastructure, CI/CD pipeline, and Redis/Celery hardening

- Add docker-compose.ha.yml for PostgreSQL/Redis HA setup with Patroni and Sentinel
- Add docker-compose.prod.yml for production deployment
- Add GitHub Actions CI/CD workflow (build.yml)
- Add install.cmd for Windows one-click setup
- Harden Redis connection with retry logic and health checks
- Add Celery HA config with Redis Sentinel support
- Add HA operations runbook
- Update README with deployment and architecture docs
- Move landing page spec to .claude/specs/design/
- Update memory intelligence PRD

backend/pyproject.toml

@@ -20,6 +20,7 @@ dependencies = [
     "sse-starlette>=2.0.0",
     "celery>=5.4.0",
     "redis>=5.0.0",
+    "edge-tts>=6.1.0",
     "openai>=1.0.0",
 ]