feat(infra): 新增生产 Dockerfile 与部署 compose

- api-gateway/Dockerfile: 多阶段构建，golang:1.22-alpine → alpine:3.20，CGO_ENABLED=0 静态编译，非 root 运行

- teacher-portal/Dockerfile: 多阶段构建，node:20-alpine builder → runner，含 HEALTHCHECK

- docker-compose.prod.yml: 本地生产编排，3 服务，强制 DEV_MODE=false

- docker-compose.deploy.yml: 服务器部署用，镜像来自 Gitea Registry，通过 edu-shared 外部网络连接 MySQL/Redis

- deploy.env.example: 部署环境变量模板

infra/docker-compose.deploy.yml

@@ -0,0 +1,105 @@
+# 服务器部署用 Docker Compose
+# 镜像来源：Gitea Container Registry (git.eazygame.cn/xiner/edu/<service>:<tag>)
+# 基础设施：MySQL + Redis 已在服务器 Docker 中运行（不在此文件管理）
+#
+# 部署目录：/opt/edu/
+# 部署命令（CI 自动执行）：
+#   IMAGE_TAG=latest docker compose pull && docker compose up -d
+#
+# 首次部署手动步骤：
+#   1. sudo mkdir -p /opt/edu && sudo chown -R $USER:$USER /opt/edu
+#   2. cp infra/docker-compose.deploy.yml /opt/edu/docker-compose.yml
+#   3. cp infra/deploy.env.example /opt/edu/.env && 编辑填入生产密钥
+#   4. docker login git.eazygame.cn -u <user> -p <token>
+#   5. cd /opt/edu && IMAGE_TAG=latest docker compose up -d
+
+name: edu
+
+services:
+  api-gateway:
+    image: git.eazygame.cn/xiner/edu/api-gateway:${IMAGE_TAG:-latest}
+    container_name: edu-api-gateway
+    restart: unless-stopped
+    environment:
+      API_GATEWAY_PORT: ${API_GATEWAY_PORT:-8080}
+      JWT_SECRET: ${JWT_SECRET}
+      JWT_ISSUER: ${JWT_ISSUER:-next-edu-cloud}
+      JWT_AUDIENCE: ${JWT_AUDIENCE:-next-edu-cloud}
+      # 生产环境强制关闭 dev-token 旁路
+      DEV_MODE: "false"
+      CLASSES_SERVICE_URL: http://classes:3001
+      IAM_SERVICE_URL: http://iam:3002
+      TEACHER_BFF_URL: http://teacher-bff:3003
+      OTEL_EXPORTER_OTLP_ENDPOINT: ${OTEL_EXPORTER_OTLP_ENDPOINT:-http://otel-collector:4318}
+      LOG_LEVEL: ${LOG_LEVEL:-info}
+    ports:
+      - "${API_GATEWAY_PORT:-8080}:8080"
+    depends_on:
+      classes:
+        condition: service_healthy
+    healthcheck:
+      test: ["CMD", "wget", "--quiet", "--spider", "http://localhost:8080/healthz"]
+      interval: 30s
+      timeout: 5s
+      start_period: 10s
+      retries: 3
+    networks:
+      - edu-net
+      - edu-shared
+
+  classes:
+    image: git.eazygame.cn/xiner/edu/classes:${IMAGE_TAG:-latest}
+    container_name: edu-classes
+    restart: unless-stopped
+    environment:
+      PORT: 3001
+      # 连接服务器已有的 MySQL（容器名 edu-mysql，需在 edu-shared 网络）
+      DATABASE_URL: ${DATABASE_URL}
+      REDIS_URL: ${REDIS_URL}
+      KAFKA_BROKERS: ${KAFKA_BROKERS:-}
+      OTEL_EXPORTER_OTLP_ENDPOINT: ${OTEL_EXPORTER_OTLP_ENDPOINT:-http://otel-collector:4318}
+      LOG_LEVEL: ${LOG_LEVEL:-info}
+    healthcheck:
+      test: ["CMD", "wget", "--quiet", "--spider", "http://localhost:3001/healthz"]
+      interval: 30s
+      timeout: 5s
+      start_period: 30s
+      retries: 5
+    networks:
+      - edu-net
+      - edu-shared
+
+  teacher-portal:
+    image: git.eazygame.cn/xiner/edu/teacher-portal:${IMAGE_TAG:-latest}
+    container_name: edu-teacher-portal
+    restart: unless-stopped
+    environment:
+      NODE_ENV: production
+      PORT: 3000
+      API_GATEWAY_URL: http://api-gateway:8080
+    ports:
+      - "${TEACHER_PORTAL_PORT:-3000}:3000"
+    depends_on:
+      api-gateway:
+        condition: service_healthy
+    healthcheck:
+      test: ["CMD", "wget", "--quiet", "--spider", "http://localhost:3000/"]
+      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:
+    driver: bridge
+  # 与已有 MySQL/Redis 共享的网络
+  # 需确保 MySQL/Redis 容器已加入名为 edu-shared 的网络：
+  #   docker network create edu-shared  （若不存在）
+  #   docker network connect edu-shared edu-mysql
+  #   docker network connect edu-shared edu-redis
+  edu-shared:
+    external: true