fix training: use LoRAConfigV2 instead of Union type alias

app.py

@@ -302,8 +302,7 @@ def train_lora(
 
         from acestep.training_v2.model_loader import load_decoder_for_training
         from acestep.training_v2.trainer_fixed import FixedLoRATrainer
-        from acestep.training_v2.fixed_lora_module import AdapterConfig
-        from acestep.training_v2.configs import TrainingConfigV2
+        from acestep.training_v2.configs import TrainingConfigV2, LoRAConfigV2
 
         # Load model for training
         model = load_decoder_for_training(
@@ -313,11 +312,10 @@ def train_lora(
             precision="float32",
         )
 
-        adapter_cfg = AdapterConfig(
+        adapter_cfg = LoRAConfigV2(
             rank=rank,
             alpha=rank,
             dropout=0.0,
-            adapter_type="lora",
         )
 
         train_cfg = TrainingConfigV2(