fix: 修复 GetProviderListAsync 查询过滤与排序，避免遗漏提供商

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

@@ -79,10 +79,9 @@ public class ModelService : ApplicationService, IModelService
     public async Task<List<string>> GetProviderListAsync()
     {
         var providers = await _modelRepository._DbQueryable
-            .Where(x => !x.IsDeleted && x.IsEnabled)
+            .Where(x => x.IsEnabled)
             .Where(x => !string.IsNullOrEmpty(x.ProviderName))
             .GroupBy(x => x.ProviderName)
-            .OrderBy(x => x.OrderNum)
             .Select(x => x.ProviderName)
             .ToListAsync();