fix(train_page): 捕获训练过程中的异常并终止 TensorBoard 进程

- 在训练过程中添加异常捕获，将异常信息转换为 gr.Error 抛出
- 确保在发生异常时也能终止 TensorBoard 子进程

frontend/train_page.py

@@ -82,6 +82,8 @@ def train_page():
                             dataset, new_training_dir, 
                             learning_rate, per_device_train_batch_size, epoch,
                             save_steps, lora_rank)
+            except Exception as e:
+                raise gr.Error(str(e))
             finally:
                 # 确保训练结束后终止 TensorBoard 子进程
                 tensorboard_process.terminate()