caddy-cf now bundles WeidiDeng/caddy-cloudflare-ip, so document
'trusted_proxies cloudflare { interval 12h; timeout 15s }' as the
primary (auto-refreshing) approach, with the static-list method noted
as the fallback for builds without the plugin. Also explains
client_ip_headers (Cf-Connecting-Ip preferred, X-Forwarded-For fallback).