feat(admin-portal): docker 本地测试通过 + 下游工作清单

docker Desktop 本地验证：
- 镜像构建成功（edu/admin-portal:test）
- 容器运行正常（端口 4003）
- /api/health、/api/ready、/login、/admin/dashboard 全部 200

修复项：
- next.config.js 添加 output: standalone
- package.json 添加 autoprefixer 依赖
- login/layout.tsx 提供 AuthProvider/ToastProvider

部署配置：
- docker-compose.deploy.yml 添加 admin-portal 服务
- deploy.env.example 添加 ADMIN_PORTAL_PORT

下游工作清单（nextstep.md）：
- api-gateway: 缺 /api/admin/graphql 路由
- teacher-bff: 缺 16 Query + 11 Mutation
- iam: 缺 BatchGetUsers 等 RPC

infra/docker-compose.deploy.yml

@@ -315,6 +315,40 @@ services:
       - edu-net
       - edu-shared
 
+  admin-portal:
+    build:
+      context: ./repo
+      dockerfile: apps/admin-portal/Dockerfile
+    container_name: edu-admin-portal
+    restart: unless-stopped
+    environment:
+      NODE_ENV: production
+      PORT: 4003
+      API_GATEWAY_URL: http://api-gateway:8080
+      # 生产环境强制关闭 mock，使用真实后端
+      NEXT_PUBLIC_API_MOCKING: "disabled"
+      NEXT_PUBLIC_MF_ENABLED: "false"
+      NEXT_PUBLIC_SHELL_URL: http://admin-portal:4003
+      NEXT_PUBLIC_WS_URL: ws://push-gateway:8081/ws
+      NEXT_PUBLIC_OTEL_ENDPOINT: ${OTEL_EXPORTER_OTLP_ENDPOINT:-http://otel-collector:4318}
+      NEXT_PUBLIC_WEB_VITALS_ENDPOINT: /api/admin/web-vitals
+    ports:
+      - "${ADMIN_PORTAL_PORT:-4003}:4003"
+    depends_on:
+      api-gateway:
+        condition: service_healthy
+      teacher-bff:
+        condition: service_healthy
+    healthcheck:
+      test: ["CMD", "wget", "--quiet", "--spider", "http://localhost:4003/api/ready"]
+      interval: 30s
+      timeout: 5s
+      start_period: 20s
+      retries: 3
+    networks:
+      - edu-net
+      - edu-shared
+
 networks:
   # 应用服务内部网络
   edu-net: