fix: 修复剩余令牌统计逻辑，增加过期时间判断

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

@@ -133,7 +133,8 @@ public class PremiumPackageManager : DomainService
     {
         return await _premiumPackageRepository._DbQueryable
             .Where(x => x.UserId == userId && x.IsActive && x.RemainingTokens > 0)
-            .Where(p => p.IsAvailable())
+            .Where(p => p.IsActive)
+            .Where(p => !p.ExpireDateTime.HasValue || p.ExpireDateTime.Value >= DateTime.Now)
             .SumAsync(p => p.RemainingTokens);
     }