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

feat(emailer): add Postmark and Resend providers

backend/Infrastructure/Security/RefreshTokenGenerator.cs

@@ -0,0 +1,13 @@
+using System.Security.Cryptography;
+
+namespace Hutopy.Infrastructure.Security;
+
+public static class RefreshTokenGenerator
+{
+    public static string Next()
+    {
+        var randomNumber = new byte[32];
+        RandomNumberGenerator.Fill(randomNumber);
+        return Convert.ToBase64String(randomNumber);
+    }
+}