feat: 新增用户数据导出功能

Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Application.Contracts/Dtos/UsageStatistics/DailyTokenUsageDto.cs

@@ -0,0 +1,17 @@
+namespace Yi.Framework.AiHub.Application.Contracts.Dtos.UsageStatistics;
+
+/// <summary>
+/// 每日Token使用量统计DTO
+/// </summary>
+public class DailyTokenUsageDto
+{
+    /// <summary>
+    /// 日期
+    /// </summary>
+    public DateTime Date { get; set; }
+    
+    /// <summary>
+    /// Token消耗量
+    /// </summary>
+    public long Tokens { get; set; }
+}

Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Application.Contracts/Dtos/UsageStatistics/ModelTokenUsageDto.cs

@@ -0,0 +1,22 @@
+namespace Yi.Framework.AiHub.Application.Contracts.Dtos.UsageStatistics;
+
+/// <summary>
+/// 模型Token使用量统计DTO
+/// </summary>
+public class ModelTokenUsageDto
+{
+    /// <summary>
+    /// 模型ID
+    /// </summary>
+    public string Model { get; set; }
+    
+    /// <summary>
+    /// 总消耗量
+    /// </summary>
+    public long Tokens { get; set; }
+    
+    /// <summary>
+    /// 占比（百分比）
+    /// </summary>
+    public decimal Percentage { get; set; }
+}

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

@@ -0,0 +1,21 @@
+using Yi.Framework.AiHub.Application.Contracts.Dtos.UsageStatistics;
+
+namespace Yi.Framework.AiHub.Application.Contracts.IServices;
+
+/// <summary>
+/// 使用量统计服务接口
+/// </summary>
+public interface IUsageStatisticsService
+{
+    /// <summary>
+    /// 获取当前用户近7天的Token消耗统计
+    /// </summary>
+    /// <returns>每日Token使用量列表</returns>
+    Task<List<DailyTokenUsageDto>> GetLast7DaysTokenUsageAsync();
+    
+    /// <summary>
+    /// 获取当前用户各个模型的Token消耗量及占比
+    /// </summary>
+    /// <returns>模型Token使用量列表</returns>
+    Task<List<ModelTokenUsageDto>> GetModelTokenUsageAsync();
+}