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작업 내용
S3Controller.java의 getPresignedUrl 메서드를 수정하여 여러 개의 사전 서명된 URL을 반환하도록 변경하였습니다.
변경된 메서드는 count 매개변수를 통해 반환할 URL의 개수를 지정할 수 있습니다.
각 파일에 대한 고유한 파일 이름을 생성하여 반환된 URL과 함께 응답합니다.