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/login_log_repo.go

@@ -107,7 +107,7 @@ func (r *LoginLogRepository) DeleteOldLogs(ctx context.Context, beforeDate strin
 	return r.db.WithContext(ctx).Where("created_at < ?", beforeDate).Delete(&model.LoginLog{}).Error
 }
 
-// GetStatistics 获取登录日志统计
+// GetStatistics 获取登录日志统计（使用单次 GROUP BY 查询，避免多次 COUNT）
 func (r *LoginLogRepository) GetStatistics(ctx context.Context, startTime, endTime string) (*LoginLogStatistics, error) {
 	stats := &LoginLogStatistics{}
 
@@ -119,20 +119,37 @@ func (r *LoginLogRepository) GetStatistics(ctx context.Context, startTime, endTi
 		query = query.Where("created_at <= ?", endTime)
 	}
 
-	if err := query.Count(&stats.TotalCount).Error; err != nil {
+	// 使用单次 GROUP BY 查询获取 result 计数
+	type resultCount struct {
+		Result string
+		Count  int64
+	}
+	var results []resultCount
+	err := query.Select("result, count(*) as count").Group("result").Scan(&results).Error
+	if err != nil {
 		return nil, err
 	}
 
-	if err := query.Where("result = ?", string(model.LoginResultSuccess)).Count(&stats.SuccessCount).Error; err != nil {
-		return nil, err
+	// 汇总结果
+	for _, r := range results {
+		stats.TotalCount += r.Count
+		if r.Result == string(model.LoginResultSuccess) {
+			stats.SuccessCount = r.Count
+		} else if r.Result == string(model.LoginResultFail) {
+			stats.FailCount = r.Count
+		}
 	}
 
-	if err := query.Where("result = ?", string(model.LoginResultFail)).Count(&stats.FailCount).Error; err != nil {
-		return nil, err
-	}
-
-	if err := query.Where("event = ?", string(model.LoginEventLogin)).Count(&stats.LoginCount).Error; err != nil {
-		return nil, err
+	// 单独查询登录次数
+	if startTime != "" || endTime != "" {
+		loginQuery := r.db.WithContext(ctx).Model(&model.LoginLog{})
+		if startTime != "" {
+			loginQuery = loginQuery.Where("created_at >= ?", startTime)
+		}
+		if endTime != "" {
+			loginQuery = loginQuery.Where("created_at <= ?", endTime)
+		}
+		loginQuery.Where("event = ?", string(model.LoginEventLogin)).Count(&stats.LoginCount)
 	}
 
 	return stats, nil