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/UsageStatistics/PremiumTokenUsageDto.cs

@@ -0,0 +1,22 @@
+namespace Yi.Framework.AiHub.Application.Contracts.Dtos.UsageStatistics;
+
+/// <summary>
+/// 尊享服务Token用量统计DTO
+/// </summary>
+public class PremiumTokenUsageDto
+{
+    /// <summary>
+    /// 总Token数
+    /// </summary>
+    public long PremiumTotalTokens { get; set; }
+
+    /// <summary>
+    /// 已使用Token数
+    /// </summary>
+    public long PremiumUsedTokens { get; set; }
+
+    /// <summary>
+    /// 剩余Token数
+    /// </summary>
+    public long PremiumRemainingTokens { get; set; }
+}