deployer: flock용 util-linux 추가, 헬스체크 URL localhost 포트로 수정

- Dockerfile: util-linux 패키지 추가 (flock 명령어 제공)
- deploy.sh: 헬스체크 URL을 Docker 서비스명 → localhost 호스트 포트로 변경

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

scripts/deploy.sh

@@ -60,8 +60,8 @@ echo "Waiting for services to start..."
 sleep 5
 
 HEALTH_OK=true
-for endpoint in "http://backend:8000/health" "http://stock-lab:8000/health" "http://travel-proxy:8000/health" "http://music-lab:8000/health"; do
-    if ! curl -sf --max-time 5 "$endpoint" > /dev/null 2>&1; then
+for endpoint in "http://localhost:18000/health" "http://localhost:18500/health" "http://localhost:19000/health" "http://localhost:18600/health"; do
+    if ! curl -sf --max-time 10 --retry 2 --retry-delay 3 "$endpoint" > /dev/null 2>&1; then
         echo "HEALTH_FAIL: $endpoint"
         HEALTH_OK=false
     fi