add logging config and fix bug

[WheheoHu]

No description provided.

[Copilot]

Pull Request Overview

This PR introduces a centralized logging configuration system for the dftt_timecode library and fixes a bug in the __validate_drop_frame method where the wrong variable was referenced.

Key changes include:

• Implementation of automatic log level detection based on git branch (DEBUG for dev branches, INFO for main/installed packages)
• Comprehensive test coverage for the new logging configuration module
• Migration from hardcoded logging setup to the new centralized logging system
• Bug fix: corrected variable reference in __validate_drop_frame from self.fps to fps

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
test/test_logging_config.py	Adds comprehensive test suite for logging configuration functionality including git branch detection, log level determination, and integration tests
dftt_timecode/logging_config.py	Implements new centralized logging configuration module with automatic log level detection based on git branch and environment variables
dftt_timecode/core/dftt_timerange.py	Migrates to new logging system and adds debug/error logging throughout timerange operations
dftt_timecode/core/dftt_timecode.py	Replaces manual logging setup with new logging system, fixes bug in fps validation, and improves error handling in timecode conversion
dftt_timecode/init.py	Exports new logging configuration functions for public API

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