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

feat(emailer): add Postmark and Resend providers

backend/Infrastructure/Configuration/WebsiteOptions.cs

@@ -0,0 +1,8 @@
+namespace Hutopy.Infrastructure.Configuration;
+
+public class WebsiteOptions
+{
+    public const string SectionName = "Website";
+    
+    public string FrontendBaseUrl { get; set; } = "https://localhost:5173";
+}