Override winston log by config

I want to remove info logs, there are so many info logs unnecessary and annoyed me. But the direct use of `winston` package, I am unable to override config for console print those messages.

For production we generally have only `WARN` and `ERROR` logs, but here we are only filtering `DUBUG` logs.

Start by locating the direct use of the winston package and how its console logging configuration is set. Make the log level configurable so production can suppress info and debug messages while retaining warn and error logs, then verify the resulting console output.

Written by the indexing model from the issue text.