refactor: 移除AiHub Domain层对Application.Contracts的循环依赖

移除Yi.Framework.AiHub.Domain项目中对Yi.Framework.AiHub.Application.Contracts的项目引用，解决领域层和应用层之间的循环依赖问题，符合DDD架构分层原则。

Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain.Shared/Dtos/MessageInputDto.cs

@@ -0,0 +1,13 @@
+using Yi.Framework.AiHub.Domain.Shared.Dtos.OpenAi;
+
+namespace Yi.Framework.AiHub.Domain.Shared.Dtos;
+
+public class MessageInputDto
+{
+    public string? Content { get; set; }
+    public string Role { get; set; }
+    public string ModelId { get; set; }
+    public string? Remark { get; set; }
+
+    public ThorUsageResponse? TokenUsage { get; set; }
+}