feat(repository): enhance repository methods with batch processing and transaction support

- Updated Like and Unlike methods in CommentRepository to use transactions for data consistency.
- Introduced IsLikedBatch method for batch checking if comments are liked, addressing N+1 query issues.
- Enhanced BatchDelete method in PostRepository to perform batch deletions within a single transaction, improving efficiency.
- Added BatchUpdateStatus method for posts to utilize a single SQL update for status changes, reducing database load.
- Implemented BatchUpdateSortOrder in StickerRepository using CASE WHEN for efficient sorting updates.
- Added IsFollowingBatch and IsBlockedBatch methods in UserRepository for batch checking follow and block relationships, optimizing performance.

internal/repository/message_repo.go

@@ -4,6 +4,7 @@ import (
 	"carrot_bbs/internal/model"
 	"carrot_bbs/internal/pkg/cursor"
 	"context"
+	"errors"
 	"fmt"
 	"strconv"
 	"strings"
@@ -188,7 +189,7 @@ func (r *MessageRepository) GetParticipant(conversationID string, userID string)
 	err := r.db.Where("conversation_id = ? AND user_id = ?", conversationID, userID).First(&participant).Error
 	if err != nil {
 		// 如果找不到参与者，尝试添加（修复没有参与者记录的问题）
-		if err == gorm.ErrRecordNotFound {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
 			// 检查会话是否存在
 			var conv model.Conversation
 			if err := r.db.Where("id = ?", conversationID).First(&conv).Error; err == nil {
@@ -513,7 +514,7 @@ func (r *MessageRepository) DeleteConversationByGroupID(groupID string) error {
 	conv, err := r.GetConversationByGroupID(groupID)
 	if err != nil {
 		// 如果会话不存在，直接返回
-		if err == gorm.ErrRecordNotFound {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
 			return nil
 		}
 		return err