refactor(tests): 更新查询接口类型引用

- 将 Mediator.IQuery<int> 替换为 IQuery<int> 类型引用
- 保持空值参数测试逻辑不变
- 确保类型转换正确性

GFramework.Core.Tests/architecture/ArchitectureContextTests.cs

@@ -129,7 +129,7 @@ public class ArchitectureContextTests
     public void SendQuery_Should_ThrowArgumentNullException_When_Query_IsNull()
     {
         // 明确指定调用旧的 IQuery<int> 重载
-        Assert.That(() => _context!.SendQuery((Mediator.IQuery<int>)null!),
+        Assert.That(() => _context!.SendQuery((IQuery<int>)null!),
             Throws.ArgumentNullException.With.Property("ParamName").EqualTo("query"));
     }