[fix] Swagger 성공 응답에 error 필드가 노출되는 문제 수정

[kyer5]

• close [chore] Swagger 성공 응답 예시에 error 필드가 함께 노출되는 문제 수정 #19

📌 개요 (why, what)

• Swagger 문서에서 성공 응답에도 error 필드가 노출되는 문제 수정

🛠️ 구현 방법 (how)

• springdoc은 컨트롤러 반환 타입(ApiResponse<T>)을 정적으로 리플렉션해 스키마를 생성하므로, @JsonInclude(NON_NULL)과 무관하게 error 필드가 모든 성공 응답 스키마에 노출되고 있었음
• error 필드에 @Schema(hidden = true)를 적용해 문서에서만 제외 (런타임 JSON 직렬화는 그대로 유지)
• status 필드가 예시 값 없이 0으로 표시되던 것도 @Schema(example = "200")으로 수정

🤔 검토한 대안과 선택 이유 (trade-off)

대안	장점	단점	선택 여부
error 필드에 @Schema(hidden = true)	영향 범위 최소 (1개 파일), 응답 계약 변경 없음	에러 응답 구조가 Swagger 문서에 노출되지 않음	✅

💭 리뷰 포인트

📚 Reference (Optional)

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📥 Commits

Reviewing files that changed from the base of the PR and between 1e3683b and 47cad1e.

📒 Files selected for processing (1)

• src/main/java/com/nexters/death/global/payload/ApiResponse.java

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[gihhyeon]

LGTM~~!
제목 태그 chore 말고 fix는 어떠신가여