feat: 完成 Docker Compose 生产/开发编排文件，统一全项目镜像版本

backend/docker-compose.yml

@@ -9,19 +9,67 @@ services:
       - ./nginx/nginx.conf:/etc/nginx/nginx.conf:ro
     depends_on:
       - gateway
+    networks:
+      - backend-network
 
   gateway:
     build:
       context: ./gateway
+      dockerfile: Dockerfile
     ports:
       - "8080:8080"
     environment:
       - GO_ENV=production
+      - REDIS_ADDR=redis:6379
+    depends_on:
+      - redis
+    networks:
+      - backend-network
 
   user-svc:
     build:
       context: ./services/user-svc
+      dockerfile: Dockerfile
     ports:
       - "50051:50051"
     environment:
       - GO_ENV=production
+      - POSTGRES_HOST=postgres
+      - POSTGRES_PORT=5432
+      - POSTGRES_USER=admin
+      - POSTGRES_PASSWORD=password
+      - POSTGRES_DB=userdb
+    depends_on:
+      - postgres
+    networks:
+      - backend-network
+
+  postgres:
+    image: postgres:18.3-alpine3.23
+    ports:
+      - "5432:5432"
+    environment:
+      - POSTGRES_USER=admin
+      - POSTGRES_PASSWORD=password
+      - POSTGRES_DB=userdb
+    volumes:
+      - postgres-data:/var/lib/postgresql/data
+    networks:
+      - backend-network
+
+  redis:
+    image: redis:8.6.2-alpine
+    ports:
+      - "6379:6379"
+    volumes:
+      - redis-data:/data
+    networks:
+      - backend-network
+
+volumes:
+  postgres-data:
+  redis-data:
+
+networks:
+  backend-network:
+    driver: bridge