fix: 允许尊享包扣减到负数并优化Token统计逻辑

Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain/Managers/AiGateWayManager.cs

@@ -516,7 +516,7 @@ public class AiGateWayManager : DomainService
             await _usageStatisticsManager.SetUsageAsync(userId.Value, request.Model, data.TokenUsage);
 
             // 扣减尊享token包用量
-            var totalTokens = (data.TokenUsage?.InputTokens ?? 0) + (data.TokenUsage?.OutputTokens ?? 0);
+            var totalTokens = data.TokenUsage.TotalTokens??0;
             if (totalTokens > 0)
             {
                 var consumeSuccess = await PremiumPackageManager.ConsumeTokensAsync(userId.Value, totalTokens);