feat(评论服务): 实现评论服务基础框架

- 新增 CommentServiceImpl 实现评论相关功能
- 移除 StoryServiceClient 的熔断器配置
- 禁用 feign 熔断器配置并添加相关注释

timeline-story-service/src/main/java/com/timeline/story/service/impl/CommentServiceImpl.java

@@ -0,0 +1,90 @@
+package com.timeline.story.service.impl;
+
+import com.timeline.story.entity.StoryComment;
+import com.timeline.story.service.CommentService;
+import com.timeline.story.vo.CommentVo;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Service;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * CommentServiceImpl - 评论服务实现类
+ */
+@Slf4j
+@Service
+public class CommentServiceImpl implements CommentService {
+
+    @Override
+    public StoryComment createComment(CommentVo commentVo) {
+        log.info("创建评论: storyItemId={}", commentVo.getStoryItemId());
+        // TODO: 实现评论创建逻辑
+        return null;
+    }
+
+    @Override
+    public StoryComment replyComment(String parentId, CommentVo commentVo) {
+        log.info("回复评论: parentId={}", parentId);
+        // TODO: 实现回复逻辑
+        return null;
+    }
+
+    @Override
+    public void deleteComment(String commentInstanceId) {
+        log.info("删除评论: commentInstanceId={}", commentInstanceId);
+        // TODO: 实现删除逻辑
+    }
+
+    @Override
+    public StoryComment getCommentById(String commentInstanceId) {
+        log.info("获取评论: commentInstanceId={}", commentInstanceId);
+        // TODO: 实现查询逻辑
+        return null;
+    }
+
+    @Override
+    public List<CommentVo> getCommentsByStoryItem(String storyItemId, int pageNum, int pageSize) {
+        log.info("获取节点评论列表: storyItemId={}", storyItemId);
+        // 返回空列表
+        return new ArrayList<>();
+    }
+
+    @Override
+    public List<CommentVo> getRepliesByComment(String parentId, int pageNum, int pageSize) {
+        log.info("获取评论回复列表: parentId={}", parentId);
+        // 返回空列表
+        return new ArrayList<>();
+    }
+
+    @Override
+    public int getCommentCountByStoryItem(String storyItemId) {
+        log.info("获取节点评论数量: storyItemId={}", storyItemId);
+        return 0;
+    }
+
+    @Override
+    public void likeComment(String commentInstanceId, String userId) {
+        log.info("点赞评论: commentInstanceId={}, userId={}", commentInstanceId, userId);
+        // TODO: 实现点赞逻辑
+    }
+
+    @Override
+    public void unlikeComment(String commentInstanceId, String userId) {
+        log.info("取消点赞评论: commentInstanceId={}, userId={}", commentInstanceId, userId);
+        // TODO: 实现取消点赞逻辑
+    }
+
+    @Override
+    public boolean hasLiked(String commentInstanceId, String userId) {
+        log.info("检查是否已点赞: commentInstanceId={}, userId={}", commentInstanceId, userId);
+        return false;
+    }
+
+    @Override
+    public List<CommentVo> getCommentsByUser(String userId, int pageNum, int pageSize) {
+        log.info("获取用户评论列表: userId={}", userId);
+        // 返回空列表
+        return new ArrayList<>();
+    }
+}