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Add proxy-read-timeout and proxy-send-timeout (3600s) so nginx does not
drop long-lived WebSocket connections at the default 60s idle timeout.
Add use-regex: "true" to staging to match production — without it, the
ImplementationSpecific path for the game WebSocket
(/api/board/game/[A-Za-z0-9]{8}/ws) is treated as a literal string
instead of a regex and never matches real game IDs.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>