修改User模块，同步原始代码

Core/MAX.Framework/Validation/RequestValidator.cs

@@ -0,0 +1,27 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace MAX.Framework.Validation;
+
+/// <summary>通用请求校验入口，供各模块复用，不依赖 HTTP、数据库或具体业务。</summary>
+public static class RequestValidator
+{
+    /// <summary>
+    /// 检查对象非空，并验证全部属性上的数据注解及 IValidatableObject 规则。
+    /// 不递归验证子对象；对象为空抛出 ArgumentNullException，规则不满足抛出 ValidationException。
+    /// </summary>
+    public static void Validate(object? request)
+    {
+        ArgumentNullException.ThrowIfNull(request);
+        Validator.ValidateObject(request, new ValidationContext(request), validateAllProperties: true);
+    }
+
+    /// <summary>不抛出规则验证异常，适用于登录等需要自行处理校验结果的入口；对象为空仍视为调用错误。</summary>
+    public static bool TryValidate(object? request, out IReadOnlyList<ValidationResult> errors)
+    {
+        ArgumentNullException.ThrowIfNull(request);
+        var results = new List<ValidationResult>();
+        bool valid = Validator.TryValidateObject(request, new ValidationContext(request), results, validateAllProperties: true);
+        errors = results.AsReadOnly();
+        return valid;
+    }
+}