fix(deploy): default gluecron port 3001 (Crontech owns 3000 on shared box)

fix(deploy): default gluecron port 3001 (Crontech owns 3000 on shared box)

Root cause of the gluecron.com EADDRINUSE crash-loop. The bare-metal box
(45.76.171.37) hosts both Crontech and Gluecron. Crontech's web server
binds port 3000. The gluecron deploy script defaulted to 3000 too,
producing a 4-day systemd restart counter at 5810.

Fix: default to 3001. Caddy still resolves gluecron.com to whichever
port the env file specifies — operators just need their Caddyfile entry
in sync with PORT in /etc/gluecron.env.

For an existing box already on the broken default:
  sed -i 's/^PORT=.*/PORT=3001/' /etc/gluecron.env
  sed -i 's|reverse_proxy localhost:3000|reverse_proxy localhost:3001|' /etc/caddy/Caddyfile
  systemctl restart gluecron && systemctl reload caddy