Fix Dockerfile: add explicit Debian bookworm sources

Dockerfile

@@ -1,13 +1,14 @@
-FROM ubuntu:22.04
+FROM python:3.11-slim
 
 ENV DEBIAN_FRONTEND=noninteractive
-ENV PYTHONUNBUFFERED=1
 
-# 安装系统依赖 + Python
+# 显式添加 Debian bookworm 源（修复 slim 镜像缺源问题）
+RUN echo "deb http://deb.debian.org/debian bookworm main contrib non-free non-free-firmware" > /etc/apt/sources.list \
+ && echo "deb http://deb.debian.org/debian-security bookworm-security main contrib non-free non-free-firmware" >> /etc/apt/sources.list \
+ && echo "deb http://deb.debian.org/debian bookworm-updates main contrib non-free non-free-firmware" >> /etc/apt/sources.list
+
+# Blender headless 运行所需的系统库
 RUN apt-get update && apt-get install -y --no-install-recommends \
-    python3 \
-    python3-pip \
-    python3-venv \
     wget \
     xz-utils \
     ca-certificates \
@@ -39,7 +40,7 @@ RUN useradd -m -u 1000 appuser
 WORKDIR /app
 
 COPY requirements.txt .
-RUN pip3 install --no-cache-dir -r requirements.txt
+RUN pip install --no-cache-dir -r requirements.txt
 
 COPY app.py worker.py ./
 
@@ -52,4 +53,4 @@ ENV JOB_TIMEOUT_SECONDS=180
 EXPOSE 7860
 
 CMD mkdir -p /data/jobs && chown -R appuser:appuser /data /app 2>/dev/null || true && \
-    exec python3 -m uvicorn app:app --host 0.0.0.0 --port 7860
+    exec uvicorn app:app --host 0.0.0.0 --port 7860