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/Dtos/AiUserRoleMenuDto.cs

@@ -18,19 +18,4 @@ public class AiUserRoleMenuDto:UserRoleMenuDto
     /// VIP到期时间
     /// </summary>
     public DateTime? VipExpireTime { get; set; }
-
-    /// <summary>
-    /// 尊享包总Token数
-    /// </summary>
-    public long PremiumTotalTokens { get; set; }
-
-    /// <summary>
-    /// 尊享包已使用Token数
-    /// </summary>
-    public long PremiumUsedTokens { get; set; }
-
-    /// <summary>
-    /// 尊享包剩余Token数
-    /// </summary>
-    public long PremiumRemainingTokens { get; set; }
 }