docs: Add Grantech Docker info to CLAUDE.md

- Add grantech database to DB list
- Add Docker container management commands for Server2/Server3
- Add container table (grantech-frontend, grantech-backend, nextcloud)

CLAUDE.md

@@ -39,6 +39,33 @@
 |---------|------|------|
 | `autonet` | AutonetSellCar Production | Server1 (PostgreSQL) |
 | `autonet_staging` | AutonetSellCar Staging | Server1 (PostgreSQL) |
+| `grantech` | Grantech 사이트 | Server1 (PostgreSQL) |
+
+## Docker 컨테이너 관리
+
+### Server2 (AutonetSellCar)
+```bash
+# 위치: /opt/autonet/staging 또는 /opt/autonet/production
+docker compose -f docker-compose.staging.yml ps      # 스테이징 상태
+docker compose -f docker-compose.production.yml ps   # 프로덕션 상태
+```
+
+### Server3 (Grantech, Nextcloud)
+```bash
+# Grantech (위치: /home/damon/sites/grantech)
+ssh server3 "cd /home/damon/sites/grantech && docker compose ps"
+ssh server3 "cd /home/damon/sites/grantech && docker compose logs -f"
+ssh server3 "cd /home/damon/sites/grantech && docker compose restart"
+
+# Nextcloud
+ssh server3 "docker ps | grep nextcloud"
+```
+
+| 컨테이너 | 포트 | 설명 |
+|----------|------|------|
+| grantech-frontend | 3001 | Next.js (grantech.kr) |
+| grantech-backend | 8001 | FastAPI (api.grantech.kr) |
+| nextcloud | 8080 | Nextcloud (cloud.grantech.kr) |
 
 > **상세 인프라 문서**: [SERVER_INFRASTRUCTURE_PLAN.md](./SERVER_INFRASTRUCTURE_PLAN.md)