Cloudflare cfut_ tokens require caddy-dns/cloudflare module update

Cloudflare deprecated the old token format in early 2026 and now issues tokens prefixed with `cfut_` (user) or `cfat_` (account). The caddy-dns/cloudflare v0.2.3 module validates token format and rejects these prefixes, causing Caddy to fail to start entirely — taking ALL proxied services offline.\n\nFix: `xcaddy build --with github.com/caddy-dns/cloudflare@latest` and replace the caddy binary. PR #123 in caddy-dns/cloudflare added support for the new formats.\n\nDiscovered during n8n deployment (2026-04-09). Caddy was down for ~2 minutes affecting all services.