✨Feat: 커뮤니티 추가 API 생성

src/main/java/com/sku/refit/domain/comment/controller/CommentController.java

@@ -35,6 +35,10 @@ ResponseEntity<BaseResponse<CommentDetailResponse>> createComment(
       @RequestBody @Valid CommentRequest request,
       @Parameter(description = "댓글을 작성할 게시글 식별자", example = "1") @RequestParam Long postId);
 
+  @PostMapping("/{id}/like")
+  @Operation(summary = "댓글 좋아요 토글")
+  ResponseEntity<BaseResponse<Void>> toggleLike(@PathVariable Long id);
+
   @GetMapping
   @Operation(summary = "특정 게시글의 댓글 조회", description = "특정 게시글의 댓글 리스트를 조회합니다.")
   ResponseEntity<BaseResponse<List<CommentDetailResponse>>> getAllCommentsByPostId(

src/main/java/com/sku/refit/domain/comment/controller/CommentControllerImpl.java

@@ -35,6 +35,13 @@ public ResponseEntity<BaseResponse<CommentDetailResponse>> createComment(
     return ResponseEntity.ok(BaseResponse.success(response));
   }
 
+  @Override
+  public ResponseEntity<BaseResponse<Void>> toggleLike(@PathVariable Long id) {
+
+    commentService.toggleLike(id);
+    return ResponseEntity.ok(BaseResponse.success());
+  }
+
   @Override
   public ResponseEntity<BaseResponse<List<CommentDetailResponse>>> getAllCommentsByPostId(
       @RequestParam Long postId) {

src/main/java/com/sku/refit/domain/comment/dto/request/CommentRequest.java

@@ -21,4 +21,7 @@ public class CommentRequest {
   @NotBlank(message = "댓글 내용은 필수입니다.")
   @Schema(description = "댓글 내용", example = "답변 감사합니다~~~")
   private String content;
+
+  @Schema(description = "답글을 작성할 댓글의 식별자", example = "1")
+  private Long parentCommentId;
 }

src/main/java/com/sku/refit/domain/comment/dto/response/CommentDetailResponse.java

@@ -4,6 +4,7 @@
 package com.sku.refit.domain.comment.dto.response;
 
 import java.time.LocalDateTime;
+import java.util.List;
 
 import io.swagger.v3.oas.annotations.media.Schema;
 import lombok.Builder;
@@ -20,9 +21,24 @@ public class CommentDetailResponse {
   @Schema(description = "댓글 내용", example = "처음 가보는거라 질문 드립니다 ㅠㅠ")
   private String content;
 
+  @Schema(description = "댓글 작성자", example = "김다입")
+  private String nickname;
+
   @Schema(description = "댓글 작성자 여부", example = "true")
   private Boolean isWriter;
 
   @Schema(description = "댓글 작성 시간", example = "20250101T120000")
   private LocalDateTime createdAt;
+
+  @Schema(description = "부모 댓글 ID (null이면 일반 댓글)", example = "null")
+  private Long parentCommentId;
+
+  @Schema(description = "좋아요 개수", example = "3")
+  private Long likeCount;
+
+  @Schema(description = "내가 좋아요를 눌렀는지 여부", example = "true")
+  private Boolean isLiked;
+
+  @Schema(description = "답글 리스트")
+  private List<CommentDetailResponse> replies;
 }

src/main/java/com/sku/refit/domain/comment/entity/Comment.java

@@ -3,6 +3,10 @@
  */
 package com.sku.refit.domain.comment.entity;
 
+import java.util.ArrayList;
+import java.util.List;
+
+import jakarta.persistence.CascadeType;
 import jakarta.persistence.Column;
 import jakarta.persistence.Entity;
 import jakarta.persistence.FetchType;
@@ -11,6 +15,7 @@
 import jakarta.persistence.Id;
 import jakarta.persistence.JoinColumn;
 import jakarta.persistence.ManyToOne;
+import jakarta.persistence.OneToMany;
 import jakarta.persistence.Table;
 
 import com.sku.refit.domain.post.entity.Post;
@@ -46,6 +51,14 @@ public class Comment extends BaseTimeEntity {
   @JoinColumn(name = "post_id", nullable = false)
   private Post post;
 
+  @ManyToOne(fetch = FetchType.LAZY)
+  @JoinColumn(name = "parent_id")
+  private Comment parent;
+
+  @OneToMany(mappedBy = "parent", cascade = CascadeType.ALL, orphanRemoval = true)
+  @Builder.Default
+  private List<Comment> replies = new ArrayList<>();
+
   public void update(String content) {
     this.content = content;
   }

src/main/java/com/sku/refit/domain/comment/entity/CommentLike.java

@@ -0,0 +1,43 @@
+/* 
+ * Copyright (c) SKU 다시입을Lab 
+ */
+package com.sku.refit.domain.comment.entity;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.Table;
+import jakarta.persistence.UniqueConstraint;
+
+import com.sku.refit.domain.user.entity.User;
+import com.sku.refit.global.common.BaseTimeEntity;
+
+import lombok.AccessLevel;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Entity
+@Getter
+@Builder
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@AllArgsConstructor
+@Table(
+    name = "comment_like",
+    uniqueConstraints = {@UniqueConstraint(columnNames = {"comment_id", "user_id"})})
+public class CommentLike extends BaseTimeEntity {
+
+  @Id
+  @GeneratedValue(strategy = GenerationType.IDENTITY)
+  private Long id;
+
+  @ManyToOne(fetch = FetchType.LAZY)
+  private Comment comment;
+
+  @ManyToOne(fetch = FetchType.LAZY)
+  private User user;
+}

src/main/java/com/sku/refit/domain/comment/mapper/CommentMapper.java

@@ -3,6 +3,8 @@
  */
 package com.sku.refit.domain.comment.mapper;
 
+import java.util.List;
+
 import org.springframework.stereotype.Component;
 
 import com.sku.refit.domain.comment.dto.request.CommentRequest;
@@ -14,17 +16,32 @@
 @Component
 public class CommentMapper {
 
-  public Comment toComment(CommentRequest request, User user, Post post) {
-    return Comment.builder().content(request.getContent()).user(user).post(post).build();
+  public Comment toComment(CommentRequest request, Comment parent, User user, Post post) {
+    return Comment.builder()
+        .content(request.getContent())
+        .parent(parent)
+        .user(user)
+        .post(post)
+        .build();
   }
 
-  public CommentDetailResponse toDetailResponse(Comment comment, User user) {
+  public CommentDetailResponse toDetailResponse(
+      Comment comment,
+      User user,
+      Long likeCount,
+      Boolean isLiked,
+      List<CommentDetailResponse> replies) {
 
     return CommentDetailResponse.builder()
         .commentId(comment.getId())
         .content(comment.getContent())
+        .nickname(comment.getUser().getNickname())
         .isWriter(comment.getUser().getId().equals(user.getId()))
         .createdAt(comment.getCreatedAt())
+        .parentCommentId(comment.getParent() != null ? comment.getParent().getId() : null)
+        .likeCount(likeCount)
+        .isLiked(isLiked)
+        .replies(replies)
         .build();
   }
 }

src/main/java/com/sku/refit/domain/comment/repository/CommentLikeRepository.java

@@ -0,0 +1,46 @@
+/* 
+ * Copyright (c) SKU 다시입을Lab 
+ */
+package com.sku.refit.domain.comment.repository;
+
+import java.util.List;
+import java.util.Optional;
+import java.util.Set;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
+import org.springframework.stereotype.Repository;
+
+import com.sku.refit.domain.comment.entity.Comment;
+import com.sku.refit.domain.comment.entity.CommentLike;
+import com.sku.refit.domain.user.entity.User;
+
+@Repository
+public interface CommentLikeRepository extends JpaRepository<CommentLike, Long> {
+
+  boolean existsByCommentAndUser(Comment comment, User user);
+
+  Optional<CommentLike> findByCommentAndUser(Comment comment, User user);
+
+  long countByComment(Comment comment);
+
+  @Query(
+      """
+  select cl.comment.id, count(cl)
+  from CommentLike cl
+  where cl.comment.id in :commentIds
+  group by cl.comment.id
+""")
+  List<Object[]> countByCommentIds(@Param("commentIds") List<Long> commentIds);
+
+  @Query(
+      """
+  select cl.comment.id
+  from CommentLike cl
+  where cl.comment.id in :commentIds
+    and cl.user.id = :userId
+""")
+  Set<Long> findLikedCommentIds(
+      @Param("commentIds") List<Long> commentIds, @Param("userId") Long userId);
+}

src/main/java/com/sku/refit/domain/comment/service/CommentService.java

@@ -19,6 +19,13 @@ public interface CommentService {
    */
   CommentDetailResponse createComment(CommentRequest request, Long postId);
 
+  /**
+   * 댓글 좋아요 등록
+   *
+   * @param commentId
+   */
+  void toggleLike(Long commentId);
+
   /**
    * 특정 게시글의 댓글 전체 조회
    *