align backend auth patterns

backend/app/User/User.php

@@ -9,6 +9,7 @@ final readonly class User
     public function __construct(
         private int $id,
         private EmailAddress $email,
+        private string $passwordHash,
     ) {}
 
     public function getId(): int
@@ -20,4 +21,9 @@ final readonly class User
     {
         return $this->email;
     }
+
+    public function getPasswordHash(): string
+    {
+        return $this->passwordHash;
+    }
 }