feat(polaris)!: 改为 standalone 容器运行

将 Next.js 构建切换为 standalone，新增多阶段 Docker 镜像和非 root 运行。
CI 改为启动服务检查页面与静态资源，并移除静态导出校验。

BREAKING CHANGE: 不再生成 out/ 静态产物，部署需运行 Node 服务容器。

ts/web/nextjs/polaris/Dockerfile

@@ -0,0 +1,39 @@
+# ---------- deps: install workspace dependencies (keeps patchedDependencies) ----------
+FROM node:22.23.2-bookworm AS deps
+WORKDIR /app
+ENV COREPACK_ENABLE_DOWNLOAD_PROMPT=0
+RUN corepack enable && corepack prepare pnpm@11.24.0 --activate
+COPY package.json pnpm-lock.yaml pnpm-workspace.yaml ./
+COPY patches ./patches
+RUN pnpm install --frozen-lockfile
+
+# ---------- builder: build the standalone Next.js output ----------
+FROM node:22.23.2-bookworm AS builder
+WORKDIR /app
+ENV NEXT_TELEMETRY_DISABLED=1 \
+    COREPACK_ENABLE_DOWNLOAD_PROMPT=0
+RUN corepack enable && corepack prepare pnpm@11.24.0 --activate
+COPY --from=deps /app/node_modules ./node_modules
+COPY package.json pnpm-lock.yaml pnpm-workspace.yaml ./
+COPY patches ./patches
+COPY . .
+RUN pnpm run build
+
+# ---------- runner: minimal runtime with standalone server ----------
+FROM node:22.23.2-bookworm AS runner
+WORKDIR /app
+ENV NODE_ENV=production \
+    NEXT_TELEMETRY_DISABLED=1 \
+    PORT=3000 \
+    HOSTNAME=0.0.0.0
+
+COPY --from=builder --chown=node:node /app/public ./public
+
+RUN mkdir .next && chown node:node .next
+
+COPY --from=builder --chown=node:node /app/.next/standalone ./
+COPY --from=builder --chown=node:node /app/.next/static ./.next/static
+
+USER node
+EXPOSE 3000
+CMD ["node", "server.js"]