fix: use IPv4 for frontend healthcheck - #9
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프론트 컨테이너의
localhost가 Alpine에서 IPv6::1로 해석됐지만 Nginx는 IPv4 포트 80에서 수신하고 있어, 외부 HTTP 200 응답과 달리 Docker healthcheck가 실패했습니다.변경
http://127.0.0.1/로 고정검증
localhost실패와127.0.0.1HTTP 200을 재현git diff --check