9router combo models (deepseek-v4-flash-free fallback) have TTFT up to
30-40s. Default (proxy) response_header_timeout 30s / read 60s caused
false-positive 504 'timeout awaiting response headers' even while 9router
was processing. Give the 9router route dedicated long timeouts
(response_header 120s, read/write 300s). Syncs /etc/caddy/Caddyfile.
asepharyana