feat: enable LLM analysis by default and enhance audio tagging with filename hints

Commit notes

- Updated configuration to set ENABLE_LLM_ANALYSIS to true. - Introduced a new function to extract descriptive tags from filenames, improving differentiation of audio samples. - Enhanced the tagging logic with more granular thresholds for brightness, energy, attack, texture complexity, and harmonic content, allowing for better categorization of audio features.

This update aims to improve the accuracy and uniqueness of AI-generated tags.