Add self-service account management commands (delete, update username/email/password/profile)

web/backend/Features/Features.Auth/Commands/UpdateProfile/UpdateProfileValidator.cs

@@ -0,0 +1,28 @@
+using FluentValidation;
+
+namespace Features.Auth.Commands.UpdateProfile;
+
+/// <summary>Validates <see cref="UpdateProfileCommand" />, mirroring the profile rules in <c>RegisterUserValidator</c>.</summary>
+public class UpdateProfileValidator : AbstractValidator<UpdateProfileCommand>
+{
+    public UpdateProfileValidator()
+    {
+        RuleFor(x => x.FirstName)
+            .NotEmpty()
+            .WithMessage("First name is required")
+            .MaximumLength(128)
+            .WithMessage("First name cannot exceed 128 characters");
+
+        RuleFor(x => x.LastName)
+            .NotEmpty()
+            .WithMessage("Last name is required")
+            .MaximumLength(128)
+            .WithMessage("Last name cannot exceed 128 characters");
+
+        RuleFor(x => x.DateOfBirth)
+            .NotEmpty()
+            .WithMessage("Date of birth is required")
+            .LessThan(DateTime.Today.AddYears(-19))
+            .WithMessage("You must be at least 19 years old");
+    }
+}