add Dockerfile

Dockerfile

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+# 多阶段构建：构建阶段
+FROM python:3.11-slim AS builder
+
+# 设置工作目录
+WORKDIR /app
+
+# 安装系统依赖
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential \
+    && rm -rf /var/lib/apt/lists/*
+
+# 复制 requirements.txt
+COPY requirements.txt .
+
+# 创建虚拟环境并安装依赖
+RUN python -m venv /opt/venv
+ENV PATH="/opt/venv/bin:$PATH"
+RUN pip install --upgrade pip setuptools wheel && \
+    pip install --no-cache-dir -r requirements.txt
+
+# 最终运行阶段
+FROM python:3.11-slim
+
+# 设置工作目录
+WORKDIR /app
+
+# 设置环境变量
+ENV PYTHONUNBUFFERED=1 \
+    PYTHONDONTWRITEBYTECODE=1 \
+    PATH="/opt/venv/bin:$PATH"
+
+# 从构建阶段复制虚拟环境
+COPY --from=builder /opt/venv /opt/venv
+
+# 复制应用代码
+COPY . .
+
+# 暴露端口
+EXPOSE 8000
+
+# 启动命令
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]
+
+