refactor(config): use named logger instead of root logger

[Copilot]

Addresses review feedback on PR #40 to replace root logger usage with a named logger in app/config.py.

Changes

• Added module-level named logger: logger = logging.getLogger(__name__)
• Replaced logging.info() call with logger.info() in Settings.init

Before:

logging.info("🔧 Auto-configured API_KEY for testing environment...")

After:

logger = logging.getLogger(__name__)
# ...
logger.info("🔧 Auto-configured API_KEY for testing environment...")

This follows Python logging best practices by using a named logger (app.config) instead of the root logger, improving log traceability and configurability.

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[Neiland85]

This PR has been overtaken by the 2025 architecture refactor.
Closing it with respect, but it is no longer part of the living codebase.