Feature Request: Talk to python shared instance over unix socket

It'd be nice if there was an easy way to talk to the shared instance over the existing unix socket instead of needing to configure an extra websocket interface.

The interface is defined around [here](https://github.com/markqvist/Reticulum/blob/1bee46ed814e671d268801958bb2aa4746e4ed5e/RNS/Interfaces/LocalInterface.py#L137)

Would it be as simple as modifying the websocket code to instead use a TCP stream?

I'd be down to do a PR when I have time if you have time for some guidance on how it could be done.

Start with the linked RNS/Interfaces/LocalInterface.py interface definition and then inspect the existing websocket code. Determine whether communication with the shared Python instance can use the existing Unix socket or a TCP stream, and clarify the required interface and behavior before implementing it.

Written by the indexing model from the issue text.