Records what the gateway routes do, the four things that still have to
happen on the servers before the dropdown can light up (UUID pool per
inbound, the pool file, X-Forwarded-For on the vhost, deploy-from-repo),
and — deliberately at the same prominence — that expiry is bookkeeping
rather than enforcement until xray's handler API is wired per box.
Also flags the per-client byte cap as an unverified cheaper mitigation,
marked as needing a test rather than written up as though it works.
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