Move model and pipeline components into dedicated modules
Extract utilities from CLI into shared helpers
Update imports throughout codebase
Refactor project structure for modularity
Move model configuration and hardware selection into `models/` package
Extract pipeline steps into `pipeline/` package
Add utility helpers in `utils/` package
Update CLI imports and references
Update dependencies for MLX models
Add automatic model selection based on available RAM
Rewrite README with MLX-specific documentation
Update .gitignore for MLX project structure
