feat(2.0): 为 2.0 部署独立的 presence-service-2

- 在 docker-compose.2.0.yml 添加 presence-service-2 (port 3027)
- 使用独立数据库 rwa_mining_presence，隔离 2.0 用户 DAU/在线数据
- Redis DB 17（2.0 其他服务已用 8,10,12,13,14,15,16）
- postgres-2 POSTGRES_MULTIPLE_DATABASES 追加 rwa_mining_presence
- 复用 presence-service 代码，与 auth-service 共享 JWT_SECRET

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/services/docker-compose.2.0.yml

@@ -35,7 +35,7 @@ services:
       TZ: Asia/Shanghai
       POSTGRES_USER: ${POSTGRES_USER:-rwa_user}
       POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-rwa_secure_password}
-      POSTGRES_MULTIPLE_DATABASES: rwa_contribution,rwa_mining,rwa_trading,rwa_mining_admin,rwa_auth,rwa_mining_wallet,rwa_mining_blockchain
+      POSTGRES_MULTIPLE_DATABASES: rwa_contribution,rwa_mining,rwa_trading,rwa_mining_admin,rwa_auth,rwa_mining_wallet,rwa_mining_blockchain,rwa_mining_presence
     ports:
       # 安全加固: 仅绑定 127.0.0.1，禁止公网直连数据库
       # deploy-mining.sh 通过 docker exec 访问，不受影响
@@ -493,6 +493,49 @@ services:
     networks:
       - rwa-2-network
 
+  presence-service-2:
+    build:
+      context: ./presence-service
+      dockerfile: Dockerfile
+    container_name: rwa-presence-service-2
+    depends_on:
+      postgres-2:
+        condition: service_healthy
+        required: false
+      redis-2:
+        condition: service_healthy
+        required: false
+    environment:
+      NODE_ENV: production
+      TZ: Asia/Shanghai
+      PORT: 3027
+      # PostgreSQL - 2.0 独立的 presence 数据库
+      DATABASE_URL: postgresql://${POSTGRES_USER:-postgres}:${POSTGRES_PASSWORD:-postgres}@${POSTGRES_HOST:-postgres}:${POSTGRES_PORT:-5432}/rwa_mining_presence?schema=public
+      # Redis - 使用 DB 17 隔离 (2.0 已用: 8,10,12,13,14,15,16)
+      REDIS_HOST: ${REDIS_HOST:-redis}
+      REDIS_PORT: ${REDIS_PORT:-6379}
+      REDIS_PASSWORD: ${REDIS_PASSWORD:-}
+      REDIS_DB: 17
+      # Kafka - 发布 session-started 事件
+      KAFKA_BROKERS: ${KAFKA_BROKERS:-kafka:29092}
+      # JWT - 与 auth-service 共享密钥以验证 mining-app token
+      JWT_SECRET: ${JWT_SECRET:-your-jwt-secret-change-in-production}
+      ADMIN_JWT_SECRET: ${ADMIN_JWT_SECRET:-your-admin-jwt-secret-change-in-production}
+      # 在线窗口: 180 秒无心跳视为离线
+      PRESENCE_WINDOW_SECONDS: 180
+      SNAPSHOT_INTERVAL_SECONDS: 60
+    ports:
+      - "3027:3027"
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:3027/api/v1/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 60s
+    restart: unless-stopped
+    networks:
+      - rwa-2-network
+
   # ===========================================================================
   # Frontend Services (2.0)
   # ===========================================================================