feat: integrate wav2vec2 score into score fusion logic

Refactor code structure for improved readability and maintainability

feat: enhance score fusion confidence range and adjust CLAP weight for improved accuracy

feat: adjust confidence calculation in score fusion to improve agreement handling

feat: add CLAP and FST indicators to score fusion results

feat: add parsing functions for CLAP and FST results in score fusion

feat: enhance fuse_scores function with CLAP and FST results integration

feat: add imports for CLAPResult and FSTResult in score_fusion.py

feat: implement score fusion engine for AI music detection