添加docker构建配置

Dockerfile

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+# ====== Frontend build stage ======
+FROM node:18-alpine AS fe-builder
+WORKDIR /fe
+COPY SmyWorkCollect-Frontend/package*.json ./
+# 使用 npm install 以避免对锁文件严格校验导致构建失败
+RUN npm install
+COPY SmyWorkCollect-Frontend/ .
+# 确保不带 REACT_APP_API_URL，生产默认使用相对路径 /api
+RUN npm run build
+
+# ====== Final runtime (Python + Nginx + Supervisor) ======
+FROM python:3.11-slim
+
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1
+
+# 安装系统依赖: nginx, supervisor, curl
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends nginx supervisor curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# 创建目录结构
+WORKDIR /app
+RUN mkdir -p /app/backend \
+    /app/SmyWorkCollect-Frontend/build \
+    /app/SmyWorkCollect-Frontend/config \
+    /run/nginx \
+    /var/log/supervisor
+
+# 复制后端依赖并安装（包含 gunicorn）
+COPY SmyWorkCollect-Backend/requirements.txt /app/backend/requirements.txt
+RUN pip install --no-cache-dir -r /app/backend/requirements.txt \
+    && pip install --no-cache-dir gunicorn
+
+# 复制后端代码
+COPY SmyWorkCollect-Backend/ /app/backend/
+
+# 复制前端构建产物到预期目录（与后端中的路径逻辑兼容）
+COPY --from=fe-builder /fe/build /app/SmyWorkCollect-Frontend/build
+
+# 复制 Nginx 与 Supervisor 配置
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+COPY supervisord.conf /etc/supervisor/conf.d/supervisord.conf
+
+# 暴露对外端口 8383（Nginx 监听此端口）
+EXPOSE 8383
+
+# 运行 supervisor 同时管理 nginx 与 gunicorn（Flask）
+CMD ["/usr/bin/supervisord", "-c", "/etc/supervisor/conf.d/supervisord.conf"]