Code: revive MultiLogger extension

[ohmyfelix]

Summary

• revives the original MultiLogger idea from WIP: MultiLogger #28 in a form that works with the current codebase
• adds LoggerExtension that wraps tracy.logger, disables autowiring on the original logger, and sets Debugger logger to MultiLogger
• adds integration/unit tests for logger fan-out behavior and documents extension setup in .docs/README.md

Verification

• make qa
• make tests

Notes

• I could not push updates directly to contributte:fx (permission denied), so this PR supersedes WIP: MultiLogger #28 from my fork branch.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

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  Misses            ?       24           
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