refactor: 将尊享包Token统计逻辑从AiAccountService迁移至UsageStatisticsService，并移除AiUserRoleMenuDto相关字段

Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Application.Contracts/IServices/IUsageStatisticsService.cs

@@ -18,4 +18,10 @@ public interface IUsageStatisticsService
     /// </summary>
     /// <returns>模型Token使用量列表</returns>
     Task<List<ModelTokenUsageDto>> GetModelTokenUsageAsync();
+
+    /// <summary>
+    /// 获取当前用户尊享服务Token用量统计
+    /// </summary>
+    /// <returns>尊享服务Token用量统计</returns>
+    Task<PremiumTokenUsageDto> GetPremiumTokenUsageAsync();
 }