fix: s3 url 오류 수정

Author: sapiens2000

src/main/java/com/example/log4u/domain/media/service/PresignedUrlService.java

@@ -38,7 +38,9 @@ public PresignedUrlResponseDto generatePresignedUrl(PresignedUrlRequestDto reque
 		// 파일명 생성
 		String originalFilename = request.filename();
 		String fileExtension = getFileExtension(originalFilename);
-		String storedFilename = "images/" + UUID.randomUUID() + fileExtension;
+
+		//String storedFilename = "images/" + UUID.randomUUID() + fileExtension;
+		String storedFilename = UUID.randomUUID() + fileExtension;
 
 		// S3 접근 URL 생성
 		String accessUrl = String.format("https://%s.s3.%s.amazonaws.com/%s", bucketName, s3Region, storedFilename);