FEAT: Warn on unknown keys in config file

[andrinoff]

Is your feature request related to a problem?

Typos in config keys are silently ignored.

Describe the solution you'd like

Emit a warning listing unrecognized config keys at startup.

Describe alternatives you've considered

Strict failure (too harsh) or silence (current).

Additional context

Beginner friendly. See config/config.go.

[floatpanebot]

Thanks for the suggestion!

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[MD-Mushfiqur123]

I've submitted PR #1614 that implements this feature - warning on unknown keys in the config file at startup.