feat : 편지 상세보기 열람 여부, 공개 여부 DTO 정보 추가

Author: imscow11253

src/main/java/com/neighbors/tohero/application/letter/dto/GetLetterDetailResponse.java

@@ -9,10 +9,12 @@ public record LetterInfo(
         long letterId,
         String content,
         String from,
-        String to
+        String to,
+        boolean isOpened,
+        boolean isPublic
     ){}
 
     public static GetLetterDetailResponse from(Letter letter) {
-        return new GetLetterDetailResponse(new LetterInfo(letter.getLetterId(), letter.getLetterContent(), letter.getWriter(), letter.getTargetName()));
+        return new GetLetterDetailResponse(new LetterInfo(letter.getLetterId(), letter.getLetterContent(), letter.getWriter(), letter.getTargetName(), letter.isOpened(), letter.isPublic()));
     }
 }