Update Dockerfile

Dockerfile

@@ -132,8 +132,7 @@ RUN echo "Verifying model files..." && \
     ls -lh models/onnx_models_v15/ 2>/dev/null || echo "onnx_models_v15 not found"
 
 # 清理 pip 缓存和临时文件
-RUN pip cache purge && \
-    rm -rf /tmp/* /root/.cache/pip /root/.local/share/pip
+RUN rm -rf /tmp/* /root/.cache/pip /root/.local/share/pip
 
 # 暴露端口
 EXPOSE 7860