WebUI server url should include username and password

### Description

When starting the device agent, the logs show a line like: `Web UI Server now listening at http://127.0.0.1:1879`.

As the agent knows the username and password it should have been `http://:@127.0.01:1879` for better usability

### Epic/Story

_No response_

Search for the log message "Web UI Server now listening" and inspect where the agent constructs the displayed server URL using its known username and password. Confirm the resulting log output includes the requested credentials and host and port, then run the relevant existing checks for the device agent.

Written by the indexing model from the issue text.