fix:优化试题内容和样式排版

frontend/Dockerfile

@@ -1,20 +1,26 @@
-# 基础镜像来自 Docker Hub；请在本机配置阿里云镜像加速器后再构建（见仓库 docker-compose.yml 注释）
-FROM node:22-alpine AS builder
+# builder：Debian bookworm + glibc，避免 Alpine 下 Vite/esbuild 段错误
+FROM node:22-bookworm-slim AS builder
 
 WORKDIR /app
 
-RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories
-COPY package.json /app/package.json
-# 阿里云镜像站指定的 npm 同步源（原淘宝镜像域名已迁移至 npmmirror）
-RUN npm config set registry https://registry.npmmirror.com && npm install
+ARG NPM_REGISTRY=https://registry.npmmirror.com
+ARG DEBIAN_MIRROR_HOST=mirrors.aliyun.com
+RUN sed -i "s/deb.debian.org/${DEBIAN_MIRROR_HOST}/g; s/security.debian.org/${DEBIAN_MIRROR_HOST}/g" /etc/apt/sources.list.d/debian.sources
+
+RUN npm config set registry "${NPM_REGISTRY}"
+
+COPY package.json package-lock.json /app/
+RUN npm ci
 
 COPY . /app
 RUN npm run build \
   && test -f /app/dist/index.html \
   && ls -la /app/dist
 
+# 运行阶段：Nginx Alpine，apk 使用国内镜像加速
 FROM nginx:1.27-alpine
-RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories
+ARG ALPINE_MIRROR_HOST=mirrors.aliyun.com
+RUN sed -i "s/dl-cdn.alpinelinux.org/${ALPINE_MIRROR_HOST}/g" /etc/apk/repositories
 COPY nginx.conf /etc/nginx/conf.d/default.conf
 COPY --from=builder /app/dist /usr/share/nginx/html
 EXPOSE 80