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将条件从 "responseResult.Item2?.TokenUsage is not null || responseResult.Item2?.TokenUsage.TotalTokens > 0" 改为 "responseResult.Item2?.TokenUsage is not null && responseResult.Item2?.TokenUsage.TotalTokens > 0", 确保在访问 TotalTokens 之前先判空,避免 NullReferenceException 并正确记录 tokenUsage(文件:Yi.Framework.AiHub.Domain/Managers/AiGateWayManager.cs)。