fix: confirm email changes and enforce clean backend build

backend/src/Socialize.Api/Infrastructure/Security/MissingClaimException.cs

@@ -1,5 +1,23 @@
 namespace Socialize.Api.Infrastructure.Security;
 
-internal class MissingClaimException(
-    string claimName)
-    : Exception($"Claim '{claimName}' is missing.");
+public class MissingClaimException : Exception
+{
+    public MissingClaimException()
+    {
+    }
+
+    public MissingClaimException(string message)
+        : base(message)
+    {
+    }
+
+    public MissingClaimException(string message, Exception innerException)
+        : base(message, innerException)
+    {
+    }
+
+    internal static MissingClaimException ForClaim(string claimName)
+    {
+        return new MissingClaimException($"Claim '{claimName}' is missing.");
+    }
+}