refactor: 댓글 유저 조회 위임 제거

Author: pooreumjung

src/main/java/com/semosan/api/domain/community/comment/service/CommentService.java

@@ -35,7 +35,7 @@ public class CommentService {
     @Transactional
     public Comment create(Long postId, Long authorId, String content) {
         Post post = findPostOrThrow(postId);
-        User author = findUserOrThrow(authorId);
+        User author = userReader.findActiveUserById(authorId);
 
         Comment comment = Comment.create(post, author, content);
         Comment savedComment = commentRepository.save(comment);
@@ -46,7 +46,7 @@ public Comment create(Long postId, Long authorId, String content) {
     @Transactional
     public Comment reply(Long postId, Long authorId, Long parentId, Long mentionedUserId, String content) {
         Post post = findPostOrThrow(postId);
-        User author = findUserOrThrow(authorId);
+        User author = userReader.findActiveUserById(authorId);
         Comment requestedParent = findActiveCommentOrThrow(parentId);
 
         if (!requestedParent.getPost().getId().equals(postId)) {
@@ -56,7 +56,7 @@ public Comment reply(Long postId, Long authorId, Long parentId, Long mentionedUs
         // 대댓글에 답글을 달면 트리 깊이를 2로 유지하기 위해 1뎁스 댓글로 정규화
         Comment actualParent = requestedParent.isReply() ? requestedParent.getParent() : requestedParent;
 
-        User mentionedUser = mentionedUserId != null ? findUserOrThrow(mentionedUserId) : null;
+        User mentionedUser = mentionedUserId != null ? userReader.findActiveUserById(mentionedUserId) : null;
 
         Comment reply = Comment.reply(post, author, actualParent, mentionedUser, content);
         Comment savedReply = commentRepository.save(reply);
@@ -98,10 +98,6 @@ private Post findPostOrThrow(Long postId) {
                 .orElseThrow(() -> new GeneralException(ErrorStatus.POST_NOT_FOUND));
     }
 
-    private User findUserOrThrow(Long userId) {
-        return userReader.findActiveUserById(userId);
-    }
-
     private Comment findActiveCommentOrThrow(Long commentId) {
         return commentRepository.findByIdAndDeletedFalse(commentId)
                 .orElseThrow(() -> new GeneralException(ErrorStatus.COMMENT_NOT_FOUND));