新增 Dockerfile，调整 nextjs 配置

Dockerfile

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+# 基础阶段：安装依赖和构建应用
+FROM node:20-alpine AS base
+
+# 安装 pnpm
+RUN corepack enable && corepack prepare pnpm@10.5.2 --activate
+
+# 安装构建依赖项
+RUN apk add --no-cache libc6-compat
+WORKDIR /app
+
+# 依赖缓存阶段
+FROM base AS deps
+COPY package.json pnpm-lock.yaml* ./
+RUN pnpm fetch --prod
+RUN pnpm install --frozen-lockfile --prod
+
+# 构建阶段
+FROM base AS builder
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+
+# 环境变量设置
+ENV NEXT_TELEMETRY_DISABLED 1
+ENV NODE_ENV production
+
+# 构建应用
+RUN pnpm build
+
+# 生产阶段
+FROM node:20-alpine AS runner
+WORKDIR /app
+
+# 环境变量设置
+ENV NODE_ENV production
+ENV NEXT_TELEMETRY_DISABLED 1
+
+# 添加非 root 用户
+RUN addgroup --system --gid 1001 nodejs
+RUN adduser --system --uid 1001 nextjs
+
+# 复制必要文件
+COPY --from=builder /app/public ./public
+
+# 设置适当的权限
+RUN mkdir .next
+RUN chown -R nextjs:nodejs .next
+
+# 复制构建产物
+COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
+COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+
+# 切换到非 root 用户
+USER nextjs
+
+# 暴露端口
+EXPOSE 3000
+
+# 设置环境变量
+ENV PORT 3000
+ENV HOSTNAME "0.0.0.0"
+
+# 启动命令
+CMD ["node", "server.js"]