cloudflare: Remove deprecated DNS-over-HTTPS proxy option (#11068)

* Remove deprecated DNS-over-HTTPS proxy option from cloudflared installer

* docs(cloudflared): update notes - remove deprecated DoH proxy info

- DoH proxy-dns feature deprecated by Cloudflare (Feb 2026)
- Add tunnel setup instructions instead

install/cloudflared-install.sh

@@ -23,41 +23,6 @@ setup_deb822_repo \
 $STD apt install -y cloudflared
 msg_ok "Installed Cloudflared"
 
-read -r -p "${TAB3}Would you like to configure cloudflared as a DNS-over-HTTPS (DoH) proxy? <y/N> " prompt
-if [[ ${prompt,,} =~ ^(y|yes)$ ]]; then
-  msg_info "Creating Service"
-  cat <<EOF >/usr/local/etc/cloudflared/config.yml
-proxy-dns: true
-proxy-dns-address: 0.0.0.0
-proxy-dns-port: 53
-proxy-dns-max-upstream-conns: 5
-proxy-dns-upstream:
-  - https://1.1.1.1/dns-query
-  - https://1.0.0.1/dns-query
-  #- https://8.8.8.8/dns-query
-  #- https://8.8.4.4/dns-query
-  #- https://9.9.9.9/dns-query
-  #- https://149.112.112.112/dns-query
-EOF
-  cat <<EOF >/etc/systemd/system/cloudflared.service
-[Unit]
-Description=cloudflared DNS-over-HTTPS (DoH) proxy
-After=syslog.target network-online.target
-
-[Service]
-Type=simple
-ExecStart=/usr/local/bin/cloudflared --config /usr/local/etc/cloudflared/config.yml
-Restart=on-failure
-RestartSec=10
-KillMode=process
-
-[Install]
-WantedBy=multi-user.target
-EOF
-  systemctl enable -q --now cloudflared
-  msg_ok "Created Service"
-fi
-
 motd_ssh
 customize
 cleanup_lxc