FROM python:3.11-slim

ENV PYTHONUNBUFFERED=1 \
    PYTHONDONTWRITEBYTECODE=1 \
    PIP_NO_CACHE_DIR=1

WORKDIR /app

# 先装依赖，利用 Docker 层缓存
COPY requirements.txt ./
RUN pip install --no-cache-dir -r requirements.txt

# 拷贝应用代码
COPY app ./app

EXPOSE 8000

CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]
