更新dockerfile

Dockerfile copy

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+# 构建阶段
+FROM node:18-alpine AS builder
+
+WORKDIR /app
+
+# 先复制包管理文件，利用缓存层
+COPY package.json yarn.lock ./
+RUN yarn install --frozen-lockfile
+
+# 复制源代码并构建
+COPY . .
+RUN yarn build:prod
+
+# 提取 API 地址供运行阶段使用
+RUN grep '^VITE_BASE_API=' .env.production | sed 's/^VITE_BASE_API=[ \t]*//; s/[ \t]*$//; s/^"//; s/"$//' | tr -d '\r' > /app/.api_target
+
+# 运行阶段：nginx 服务静态文件
+FROM nginx:stable-alpine
+
+# 复制构建产物到 nginx 默认目录
+COPY --from=builder /app/dist /usr/share/nginx/html
+
+# 复制 API 目标地址文件和配置文件
+COPY --from=builder /app/.api_target /etc/nginx/.api_target
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+# 暴露 80 端口
+EXPOSE 80
+
+ENTRYPOINT ["/entrypoint.sh"]