fix: 获取图像模型时仅返回启用模型

在查询图像模型列表时加入 IsEnabled == true 过滤，避免返回已禁用的模型。文件：AiImageService.cs

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

@@ -370,6 +370,7 @@ public class AiImageService : ApplicationService
     public async Task<List<ModelGetListOutput>> GetModelAsync()
     {
         var output = await _aiModelRepository._DbQueryable
+            .Where(x=>x.IsEnabled==true)
             .Where(x => x.ModelType == ModelTypeEnum.Image)
             .Where(x => x.ModelApiType == ModelApiTypeEnum.GenerateContent)
             .OrderByDescending(x => x.OrderNum)