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

feat(emailer): add Postmark and Resend providers

backend/Modules/Identity/IdentityResultExtensions.cs

@@ -0,0 +1,14 @@
+using Hutopy.Modules.Identity.Models;
+using Microsoft.AspNetCore.Identity;
+
+namespace Hutopy.Modules.Identity;
+
+public static class IdentityResultExtensions
+{
+    public static Result ToApplicationResult(this IdentityResult result)
+    {
+        return result.Succeeded
+            ? Result.Success()
+            : Result.Failure(result.Errors.Select(e => e.Description));
+    }
+}