Fix src/__init__.py: export download_hf_dataset instead of removed LoRATrainer

src/__init__.py

@@ -5,14 +5,14 @@ __init__.py for src package
 from .ace_step_engine import ACEStepEngine
 from .timeline_manager import TimelineManager
 from .audio_processor import AudioProcessor
-from .lora_trainer import LoRATrainer
+from .lora_trainer import download_hf_dataset
 from .utils import setup_logging, load_config
 
 __all__ = [
     'ACEStepEngine',
     'TimelineManager',
     'AudioProcessor',
-    'LoRATrainer',
+    'download_hf_dataset',
     'setup_logging',
     'load_config'
 ]