feat: 新增获取指定日期各模型Token统计接口

- 在 AiAccountService 中新增 TokenStatisticsInput DTO 与 POST /account/token-statistics 接口（GetTokenStatisticsAsync），用于按模型统计指定日期的 token 使用量、调用次数并计算成本，返回文本摘要。
- 注入 MessageAggregateRoot 仓储（_messageRepository），使用 SqlSugar 聚合查询（Sum/Count），按 modelId 与日期范围过滤，并只统计 role == "system" 的记录。
- 成本计算逻辑：根据输入的模型 1 亿 token 成本与实际 token 数计算每 1 亿 token 成本；同时输出调用次数与 token（单位万）。
- 接口权限与入参校验：仅允许 CurrentUser.UserName 为 "Guo" 或 "cc" 访问；必须提供 ModelCosts 配置。
- 添加的引用：SqlSugar、System.Globalization、System.Text、Yi.Framework.AiHub.Domain.Entities.Chat。

Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Application/Services/AiAccountService.cs

@@ -1,10 +1,14 @@
 using Mapster;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
+using SqlSugar;
+using System.Globalization;
+using System.Text;
 using Volo.Abp.Application.Services;
 using Volo.Abp.Users;
 using Yi.Framework.AiHub.Application.Contracts.Dtos;
 using Yi.Framework.AiHub.Domain.Entities;
+using Yi.Framework.AiHub.Domain.Entities.Chat;
 using Yi.Framework.Rbac.Application.Contracts.IServices;
 using Yi.Framework.Rbac.Domain.Shared.Dtos;
 using Yi.Framework.SqlSugarCore.Abstractions;
@@ -18,17 +22,18 @@ public class AiAccountService : ApplicationService
     private ISqlSugarRepository<AiUserExtraInfoEntity> _userRepository;
     private ISqlSugarRepository<AiRechargeAggregateRoot> _rechargeRepository;
     private ISqlSugarRepository<PremiumPackageAggregateRoot> _premiumPackageRepository;
-
+    private ISqlSugarRepository<MessageAggregateRoot> _messageRepository;
     public AiAccountService(
         IAccountService accountService,
         ISqlSugarRepository<AiUserExtraInfoEntity> userRepository,
         ISqlSugarRepository<AiRechargeAggregateRoot> rechargeRepository,
-        ISqlSugarRepository<PremiumPackageAggregateRoot> premiumPackageRepository)
+        ISqlSugarRepository<PremiumPackageAggregateRoot> premiumPackageRepository, ISqlSugarRepository<MessageAggregateRoot> messageRepository)
     {
         _accountService = accountService;
         _userRepository = userRepository;
         _rechargeRepository = rechargeRepository;
         _premiumPackageRepository = premiumPackageRepository;
+        _messageRepository = messageRepository;
     }
 
     /// <summary>
@@ -148,4 +153,90 @@ public class AiAccountService : ApplicationService
 
         return result;
     }
-}
+
+    public class TokenStatisticsInput
+    {
+        /// <summary>
+        /// 指定日期(当天零点)
+        /// </summary>
+        public DateTime Date { get; set; }
+
+        /// <summary>
+        /// 模型Id -> 1亿Token成本(RMB)
+        /// </summary>
+        public Dictionary<string, decimal> ModelCosts { get; set; } = new();
+    }
+
+    /// <summary>
+    /// 获取指定日期各模型Token统计
+    /// </summary>
+    [Authorize]
+    [HttpPost("account/token-statistics")]
+    public async Task<string> GetTokenStatisticsAsync([FromBody] TokenStatisticsInput input)
+    {
+        if (CurrentUser.UserName != "Guo" && CurrentUser.UserName != "cc")
+        {
+            throw new UserFriendlyException("您暂无权限访问");
+        }
+
+        if (input.ModelCosts is null || input.ModelCosts.Count == 0)
+        {
+            throw new UserFriendlyException("请提供模型成本配置");
+        }
+
+        var day = input.Date.Date;
+        var nextDay = day.AddDays(1);
+        var modelIds = input.ModelCosts.Keys.ToList();
+
+        var modelStats = await _messageRepository._DbQueryable
+            .Where(x => modelIds.Contains(x.ModelId))
+            .Where(x => x.CreationTime >= day && x.CreationTime < nextDay)
+            .Where(x => x.Role == "system")
+            .GroupBy(x => x.ModelId)
+            .Select(x => new
+            {
+                ModelId = x.ModelId,
+                Tokens = SqlFunc.AggregateSum(x.TokenUsage.TotalTokenCount),
+                Count = SqlFunc.AggregateCount(x.Id)
+            })
+            .ToListAsync();
+
+        var modelStatDict = modelStats.ToDictionary(x => x.ModelId, x => x);
+
+        string weekDay = day.ToString("dddd", new CultureInfo("zh-CN")) switch
+        {
+            "星期一" => "周1",
+            "星期二" => "周2",
+            "星期三" => "周3",
+            "星期四" => "周4",
+            "星期五" => "周5",
+            "星期六" => "周6",
+            "星期日" => "周日",
+            _ => day.ToString("dddd", new CultureInfo("zh-CN"))
+        };
+
+        var sb = new StringBuilder();
+        sb.AppendLine($"{day:M月d日} {weekDay}");
+
+        foreach (var kvp in input.ModelCosts)
+        {
+            var modelId = kvp.Key;
+            var cost = kvp.Value;
+
+            modelStatDict.TryGetValue(modelId, out var stat);
+            long tokens = stat?.Tokens ?? 0;
+            long count = stat?.Count ?? 0;
+
+            decimal costPerHundredMillion = tokens > 0
+                ? cost / (tokens / 100000000m)
+                : 0;
+
+            decimal tokensInWan = tokens / 10000m;
+
+            sb.AppendLine();
+            sb.AppendLine($"{modelId}  成本：【{cost:F2}RMB】  次数：【{count}次】  token：【{tokensInWan:F0}w】 1亿token成本：【{costPerHundredMillion:F2}RMB】");
+        }
+
+        return sb.ToString().TrimEnd();
+    }
+}