feat(posts): 优化帖子评论统计性能

- 在 Post 模型中添加 commentCount 和 lastReplyAt 字段
- 在 CommentService 中实现更新帖子评论统计的方法
- 在 PostMapper 中使用 Post 模型中的评论统计字段
- 新增数据库迁移脚本，添加评论统计字段和索引
- 更新相关测试用例

backend/src/main/java/com/openisle/mapper/PostMapper.java

@@ -67,7 +67,7 @@ public class PostMapper {
         dto.setCategory(categoryMapper.toDto(post.getCategory()));
         dto.setTags(post.getTags().stream().map(tagMapper::toDto).collect(Collectors.toList()));
         dto.setViews(post.getViews());
-        dto.setCommentCount(commentService.countComments(post.getId()));
+        dto.setCommentCount(post.getCommentCount());
         dto.setStatus(post.getStatus());
         dto.setPinnedAt(post.getPinnedAt());
         dto.setRssExcluded(post.getRssExcluded() == null || post.getRssExcluded());
@@ -82,7 +82,7 @@ public class PostMapper {
         List<User> participants = commentService.getParticipants(post.getId(), 5);
         dto.setParticipants(participants.stream().map(userMapper::toAuthorDto).collect(Collectors.toList()));
 
-        LocalDateTime last = commentService.getLastCommentTime(post.getId());
+        LocalDateTime last = post.getLastReplyAt();
         dto.setLastReplyAt(last != null ? last : post.getCreatedAt());
         dto.setReward(0);
         dto.setSubscribed(false);

backend/src/main/java/com/openisle/model/Post.java

@@ -72,4 +72,10 @@ public class Post {
 
     @Column(nullable = true)
     private Boolean rssExcluded = true;
+
+    @Column(nullable = false)
+    private long commentCount = 0;
+
+    @Column(nullable = true)
+    private LocalDateTime lastReplyAt;
 }

backend/src/main/java/com/openisle/service/CommentService.java

@@ -69,6 +69,10 @@ public class CommentService {
         comment.setContent(content);
         comment = commentRepository.save(comment);
         log.debug("Comment {} saved for post {}", comment.getId(), postId);
+        
+        // Update post comment statistics
+        updatePostCommentStats(post);
+        
         imageUploader.addReferences(imageUploader.extractUrls(content));
         if (!author.getId().equals(post.getAuthor().getId())) {
             notificationService.createNotification(post.getAuthor(), NotificationType.COMMENT_REPLY, post, comment,
@@ -118,6 +122,10 @@ public class CommentService {
         comment.setContent(content);
         comment = commentRepository.save(comment);
         log.debug("Reply {} saved for parent {}", comment.getId(), parentId);
+        
+        // Update post comment statistics
+        updatePostCommentStats(parent.getPost());
+        
         imageUploader.addReferences(imageUploader.extractUrls(content));
         if (!author.getId().equals(parent.getAuthor().getId())) {
             notificationService.createNotification(parent.getAuthor(), NotificationType.COMMENT_REPLY, parent.getPost(),
@@ -263,9 +271,13 @@ public class CommentService {
         imageUploader.removeReferences(imageUploader.extractUrls(comment.getContent()));
 
         // 逻辑删除评论
+        Post post = comment.getPost();
         commentRepository.delete(comment);
         // 删除积分历史
         pointHistoryRepository.deleteAll(pointHistories);
+        
+        // Update post comment statistics
+        updatePostCommentStats(post);
 
         // 重新计算受影响用户的积分
         if (!usersToRecalculate.isEmpty()) {
@@ -311,4 +323,19 @@ public class CommentService {
         int replies = commentRepository.findByParentOrderByCreatedAtAsc(comment).size();
         return reactions + replies;
     }
+    
+    /**
+     * Update post comment statistics (comment count and last reply time)
+     */
+    private void updatePostCommentStats(Post post) {
+        long commentCount = commentRepository.countByPostId(post.getId());
+        LocalDateTime lastReplyAt = commentRepository.findLastCommentTime(post);
+        
+        post.setCommentCount(commentCount);
+        post.setLastReplyAt(lastReplyAt);
+        postRepository.save(post);
+        
+        log.debug("Updated post {} stats: commentCount={}, lastReplyAt={}", 
+                post.getId(), commentCount, lastReplyAt);
+    }
 }