Feature request: Private Networking UI should show/copy the full internal URL, not just the hostname

I ran into a confusing UX issue with Railway private networking.

In the Networking settings, the Private Networking section copies only the internal hostname, like:

.railway.internal

The problem is that this looks like a complete value to use for service-to-service HTTP requests, but in practice I still needed the full internal URL including the service port, for example:

http://.railway.internal:

Because the UI only provided the hostname, I spent time debugging DNS, config, and networking before realizing the copied value was incomplete for actual HTTP usage.

Suggested improvements:

1. Show the listening port in the Private Networking UI.

2. Add a “Copy full internal URL” button.

3. Show an example format like:

http://.railway.internal:

4. Add a note that the copied value is hostname-only and clients may still need the app’s listening port.

5. If possible, auto-detect and surface the active listening port.

Why this matters:

- The current UX makes the copied value feel complete when it is not.

- This is especially confusing for internal HTTP integrations.

- It leads to unnecessary debugging.

This is mainly a UX/discoverability issue, not a networking failure.