feat: 修复代码审核报告问题

Dockerfile

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+# Stage 1: 构建前端
+FROM node:20-alpine AS frontend-builder
+
+ARG NPM_REGISTRY=https://registry.npmmirror.com
+
+WORKDIR /app/frontend
+COPY frontend/package*.json ./
+RUN npm install --registry=${NPM_REGISTRY}
+COPY frontend/ .
+RUN npm run build
+
+# Stage 2: Python 后端
+FROM python:3.12-slim
+
+ARG PIP_INDEX=https://pypi.tuna.tsinghua.edu.cn/simple
+
+WORKDIR /app
+
+# 安装构建依赖（部分 Python 包可能需要），并创建非 root 用户
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    gcc \
+    && rm -rf /var/lib/apt/lists/* \
+    && useradd --create-home --uid 1000 app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt -i ${PIP_INDEX}
+
+COPY . .
+COPY --from=frontend-builder /app/frontend/dist ./static
+
+# 确保数据目录对 app 用户可写
+RUN mkdir -p /app/data && chown -R app:app /app/data
+
+USER app
+
+EXPOSE 7331
+
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "7331", "--workers", "1"]