fix: ft log and setting

conf/voxcpm_v2/voxcpm_finetune_lora.yaml

@@ -2,7 +2,7 @@ pretrained_path: /path/to/VoxCPM2/
 train_manifest: /path/to/train.jsonl
 val_manifest: null
 sample_rate: 16000        # AudioVAE encoder input rate; must match audio_vae_config.sample_rate
-out_sample_rate: 48000    # AudioVAE decoder output rate; only used at inference, not during training
+out_sample_rate: 48000    # AudioVAE decoder output rate; used for TensorBoard audio logging
 batch_size: 2
 grad_accum_steps: 8  # effective batch size = batch_size × grad_accum_steps = 16
 num_workers: 8
@@ -15,6 +15,7 @@ weight_decay: 0.01
 warmup_steps: 100
 max_steps: 1000
 max_batch_tokens: 8192
+max_grad_norm: 1.0        # gradient clipping max norm; 0 = disabled
 save_path: /path/to/checkpoints/finetune_lora
 tensorboard: /path/to/logs/finetune_lora
 lambdas: