many fixes and improvements - rework for modules/ and common/

feat(emailer): add Postmark and Resend providers

backend/Modules/Identity/Data/Role.cs

@@ -0,0 +1,9 @@
+using Microsoft.AspNetCore.Identity;
+
+namespace Hutopy.Modules.Identity.Data;
+
+public class Role : IdentityRole<Guid>
+{
+    public Role() { }
+    public Role(string roleName) : base(roleName) { }
+}