feat: Add public IP address display to Docker commands

- Add getPublicIP() helper function using https://api.ipify.org
- Display public IP in both interactive and CLI mode when starting containers
- Show local (localhost:1337) and public IP addresses
- Add note about port forwarding requirement for public access
- Works in both 'npm start' interactive mode and 'node scripts/cli.js docker-up' command-line mode

Example output:
   Local: http://localhost:1337
   Dashboard: http://localhost:8080
   Public: http://185.14.232.1:1337
     (make sure port 1337 is forwarded in your router)