fix

Application/Exceptions/ValidationException.cs

@@ -0,0 +1,11 @@
+namespace Application.Exceptions;
+
+/// <summary>
+/// 业务验证异常（对应HTTP 400 Bad Request）
+/// </summary>
+/// <remarks>
+/// 用于参数验证失败、业务规则不满足等场景
+/// </remarks>
+public class ValidationException(string message) : ApplicationException(message)
+{
+}