Refactor audio codec handling: reorganize code structure, improve readability, add safety checks, and group related functions for better maintainability. - #75

This PR introduces a comprehensive refactor of the audio codec handling system, aimed at improving code organization, readability, and maintainability. Key improvements include:

• Code Structure Reorganization: Grouped related functions and sections (e.g., audio module loading, MP3/AT3 info handling, callbacks) for better clarity.
• Safety Enhancements: Added necessary null checks in critical areas to prevent segmentation faults and ensure safe execution.
• Consistent Formatting: Improved the consistency of formatting, making the code easier to read and maintain.
• Modularized Functions: Separated concerns into distinct functions to reduce redundancy and improve modularity.
• Inline Documentation: Added comments and section headers for better understanding and future maintainability.

This refactor does not introduce any new functionality but significantly improves the overall quality and maintainability of the codebase.