Allow limiting log output in Home Assistant Addon log

**Describe the problem you have/What new integration you would like**
The addon continuously messages the system log with lines of the form `DATE INFO 304 GET /devices (0.0.0.0) 1.55ms`. This is pretty annoying for those trying to debug other issues, and is not needed.

**Please describe your use case for this integration and alternatives you've tried:**
I searched high and low for a switch to disable debug logging, to no avail. This is in the home assistant addon itself, not any other component. While it is possible to filter out messages via journalctl, they are still being saved, and are completely unneeded.

**Additional context**
Allowing a setting in the home assistant addon configuration to limit the log level would be ideal.

Start by locating the Home Assistant addon configuration and the entry point that emits the repeated system-log lines. Trace how the addon handles log levels or debug logging, then define the configuration setting needed to suppress routine output and verify that the messages are no longer saved while useful logs remain available.

Written by the indexing model from the issue text.