fix: 修复bug - 在可用性检查中支持忽略剩余令牌校验，避免负数用量包被错误过滤

- 将 PremiumPackageAggregateRoot.IsAvailable 增加参数 isVerifyRemainingToken=true，保持默认行为不变，允许按需跳过对 RemainingTokens 的校验。
- 在 UsageStatisticsService 中计算可用包时改为使用 p.IsAvailable(false)，仅过滤过期或禁用的包，但不再因 RemainingTokens 为负而将包排除，从而保证统计（如 TotalTokens/RemainingTokens 汇总）包含负数用量的包，修正统计错误。

修改文件：
- Yi.Framework.AiHub.Domain/Entities/PremiumPackageAggregateRoot.cs
- Yi.Framework.AiHub.Application/Services/UsageStatisticsService.cs

Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Application/Services/UsageStatisticsService.cs

@@ -125,9 +125,9 @@ public class UsageStatisticsService : ApplicationService, IUsageStatisticsServic
 
         if (premiumPackages.Any())
         {
-            // 过滤掉已过期的包
+            // 过滤掉已过期、禁用的包，不过滤用量负数的包
             var validPackages = premiumPackages
-                .Where(p => p.IsAvailable())
+                .Where(p => p.IsAvailable(false))
                 .ToList();
 
             result.PremiumTotalTokens = validPackages.Sum(x => x.TotalTokens);

Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain/Entities/PremiumPackageAggregateRoot.cs

@@ -86,14 +86,14 @@ public class PremiumPackageAggregateRoot : FullAuditedAggregateRoot<Guid>
     /// 检查是否可用
     /// </summary>
     /// <returns>是否可用</returns>
-    public bool IsAvailable()
+    public bool IsAvailable(bool isVerifyRemainingToken=true)
     {
         if (!IsActive)
         {
             return false;
         }
 
-        if (RemainingTokens <= 0)
+        if (isVerifyRemainingToken&&RemainingTokens <= 0)
         {
             return false;
         }