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

feat(emailer): add Postmark and Resend providers

backend/Infrastructure/Payments/Stripe/Configuration/StripeOptions.cs

@@ -0,0 +1,14 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace Hutopy.Infrastructure.Payments.Stripe.Configuration;
+
+public class StripeOptions
+{
+    public const string ConfigurationSection = "Stripe";
+    
+    [Required] public required string SecretKey { get; init; }
+
+    [Required] public required string WebhookSecret { get; init; }
+
+    [Required] [Range(0, 1)] public required decimal HutopyRate { get; init; }
+}