Update ISO installer tiers and backend deployment

ansible/roles/cezen-ttyd/files/cezen-ttyd.service

@@ -0,0 +1,17 @@
+[Unit]
+Description=Cezen Web Terminal (ttyd)
+After=network.target
+
+[Service]
+# Bind to localhost only — Nginx proxies /console/ to this port
+ExecStart=/usr/bin/ttyd \
+    --port 7681 \
+    --interface 127.0.0.1 \
+    --writable \
+    login -f cezen-console
+Restart=always
+RestartSec=5
+User=root
+
+[Install]
+WantedBy=multi-user.target