fix(deploy): 容器以 root 运行以获得 HF 持久化卷 /data 的写权限

- Dockerfile 增加 USER root，绕过 mambaorg/micromamba 默认用户 $MAMBA_USER
对挂载卷无写权限的问题，修复 PermissionError: '/data/outputs'
- HF Spaces 容器本身已沙箱隔离，MVP 阶段 root 运行可接受

Dockerfile

@@ -7,6 +7,10 @@ RUN micromamba create -y -f /tmp/environment.yml && micromamba clean --all --yes
 
 COPY --chown=$MAMBA_USER:$MAMBA_USER . /app
 
+# Run as root to avoid PermissionError on HF Spaces persistent volumes
+# (mounted /data is owned by root; switching USER before app start is the simplest fix).
+USER root
+
 ENV AIGC_ARTIFACT_ROOT=/data/outputs
 ENV GRADIO_SERVER_NAME=0.0.0.0
 ENV GRADIO_SERVER_PORT=7860