When inside Coder, use Coder wildcard URLs to open loopback URLs and 0.0.0.0

[bpmct]

Our web terminal and code-server will link localhost URLs to the proper Coder port URL.

Web terminal:

https://github.com/coder/coder/blob/adc777540510011c4126b602ac9827fa0e04cd70/site/src/pages/TerminalPage/TerminalPage.tsx#L96-L108

code-server:

https://github.com/coder/code-server/blob/9184b645cc7aa41b750e2f2ef956f2896512dd84/patches/proxy-uri.diff#L1-L20

This creates a nice UX where it magically goes to the port. However, mux doesn't support this:

Screen.Recording.2026-02-12.at.7.02.01.AM.mov