fix: Pre-download Helsinki-NLP/opus-mt-en-zh model in Dockerfile

Dockerfile

@@ -11,6 +11,9 @@ RUN pip install --no-cache-dir -r requirements.txt
 # 复制应用代码
 COPY . .
 
+# 预下载模型以避免运行时权限问题
+RUN python -c "from transformers import AutoTokenizer, AutoModelForSeq2SeqLM; AutoTokenizer.from_pretrained('Helsinki-NLP/opus-mt-en-zh'); AutoModelForSeq2SeqLM.from_pretrained('Helsinki-NLP/opus-mt-en-zh')"
+
 # 暴露端口
 EXPOSE 7860