feat(auth): implement token-based authentication

feat(auth): implement token-based authentication

• Add token authentication support as an alternative to username/password
• Update configuration models to include optional token field
• Modify socket.io authentication to use token when available
• Add documentation for token-based authentication setup

Note: Username/password authentication remains fully functional and unchanged

Full Changelog: https://github.com/oumlala/UptimeKumaRemoteProbe/commits/7.0.1