fix(infra): restore production admin api ingress

[tasoo-oos]

Description

핫픽스
Gateway 전환 중 admin API 외부 경로가 중단되지 않도록 production overlay에 Ingress를 복구합니다.

Additional context

HTTPRoute는 유지하며 production과 stage overlay 렌더링을 확인했습니다.

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• Read the Contributing Guidelines and follow the Commit
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• Provide a description in this PR that addresses what this PR is solving.
• Render the affected production and stage overlays.

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