Adding Admin API

src/api/MicCheck.Api/Organizations/InviteUserRequest.cs

@@ -0,0 +1,15 @@
+using FluentValidation;
+
+namespace MicCheck.Api.Organizations;
+
+public record InviteUserRequest(int UserId, string Role);
+
+public class InviteUserRequestValidator : AbstractValidator<InviteUserRequest>
+{
+    public InviteUserRequestValidator()
+    {
+        RuleFor(x => x.UserId).GreaterThan(0);
+        RuleFor(x => x.Role).NotEmpty().Must(r => Enum.TryParse<OrganizationRole>(r, true, out _))
+            .WithMessage("Role must be 'User' or 'Admin'.");
+    }
+}