feat: Add comprehensive logging for file operations in openai_service.py

[cmarchena]

• Implement structured logging throughout openai_service.py with appropriate levels
• Add module-level logger and enhance generate_meet_link with detailed file operation logging
• Create centralized logging configuration with file rotation (10MB, 5 backups)
• Add logging to extract_event_details, schedule_google_calendar_event, upload_file_response, and generate_response functions
• Create logs/ directory and update .gitignore to exclude log files
• Add comprehensive tests for logging behavior in test_openai_service_logging.py
• Update function docstrings to document logging behavior
• Add detailed logging documentation to README.md including configuration, levels, and common messages
• Implement security considerations to avoid logging sensitive data
• Support environment-based log level configuration via LOG_LEVEL variable

Pull Request Template

Description

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Type of Change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

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• Test B

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Checklist:

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• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
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