refactor: 清理无用代码并统一网关处理逻辑

- 移除未使用的 using 和多余空行，优化代码可读性
- 统一 yi- 前缀模型名处理逻辑，减少重复代码
- 使用 EnsureSuccessStatusCode 简化图片上传错误处理流程
- 不影响现有功能，仅做代码结构和规范优化

Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain/Managers/AiGateWayManager.cs

@@ -1,6 +1,5 @@
 using System.Collections.Concurrent;
 using System.Diagnostics;
-using System.Net;
 using System.Runtime.CompilerServices;
 using System.Text;
 using System.Text.Json;
@@ -93,14 +92,12 @@ public class AiGateWayManager : DomainService
         {
             throw new UserFriendlyException($"【{modelId}】模型当前版本【{modelApiType}】格式不支持");
         }
-
         // ✅ 统一处理 yi- 后缀（网关层模型规范化）
         if (!string.IsNullOrEmpty(aiModelDescribe.ModelId) &&
             aiModelDescribe.ModelId.StartsWith("yi-", StringComparison.OrdinalIgnoreCase))
         {
             aiModelDescribe.ModelId = aiModelDescribe.ModelId[3..];
         }
-
         return aiModelDescribe;
     }
 
@@ -980,7 +977,6 @@ public class AiGateWayManager : DomainService
     }
 
     private const string ImageStoreHost = "http://localhost:19001/api/app";
-
     /// <summary>
     /// Gemini 生成(Image)-非流式-缓存处理
     /// 返回图片绝对路径
@@ -1017,13 +1013,7 @@ public class AiGateWayManager : DomainService
         var uploadUrl = $"{ImageStoreHost}/ai-image/upload-base64";
         var content = new StringContent(JsonSerializer.Serialize(imagePrefixBase64), Encoding.UTF8, "application/json");
         var uploadResponse = await httpClient.PostAsync(uploadUrl, content, cancellationToken);
-        // uploadResponse.EnsureSuccessStatusCode();
+        uploadResponse.EnsureSuccessStatusCode();
-        if (uploadResponse.StatusCode != HttpStatusCode.OK)
-        {
-            var errorMessage = await uploadResponse.Content.ReadAsStringAsync(cancellationToken);
-            throw new UserFriendlyException($"{errorMessage}");
-        }
-
         var storeUrl = await uploadResponse.Content.ReadAsStringAsync(cancellationToken);
 
         var tokenUsage = new ThorUsageResponse