Add support for exposing multiple ports (e.g., 22 and 3000)

[soralis0912]

Thank you for your work on tsdproxy. I am using this project and would like to host applications that require multiple ports to be accessible. For example, I want to expose the following ports:

22: For SSH access.
3000: For hosting a web application like Gitea.
Currently, it seems that tsdproxy only supports exposing a single port. Could you please add support for multiple ports, or provide guidance on how this can be configured with the current setup?

This feature would make tsdproxy more flexible for hosting a variety of services.

Thank you for considering this request!