完善docker部署

frontend/Dockerfile

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+# Vue 3 Frontend
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+# 复制依赖文件
+COPY package*.json ./
+
+# 安装依赖
+RUN npm ci
+
+# 复制源代码
+COPY . .
+
+# 构建生产版本
+RUN npm run build
+
+# ==================== Nginx 运行阶段 ====================
+FROM nginx:alpine
+
+# 复制构建产物
+COPY --from=builder /app/dist /usr/share/nginx/html
+
+# 复制 Nginx 配置
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+EXPOSE 80
+
+CMD ["nginx", "-g", "daemon off;"]