Refactor code structure for improved readability and maintainability

src/__Libraries/StellaOps.Cryptography.Kms/Pkcs11Options.cs

@@ -64,7 +64,7 @@ public sealed class Pkcs11Options
     /// <summary>
     /// Gets or sets an optional factory for advanced facade injection (testing, custom providers).
     /// </summary>
-    internal Func<IServiceProvider, IPkcs11Facade>? FacadeFactory { get; set; }
+    public Func<IServiceProvider, IPkcs11Facade>? FacadeFactory { get; set; }
 
     private static TimeSpan EnsurePositive(TimeSpan value, TimeSpan fallback)
         => value <= TimeSpan.Zero ? fallback : value;