Sync Adapter to Java 25: add StripePaymentClassAdapter, README mapping

02-structural/adapter/PaymentGateway.java

@@ -1,9 +1,7 @@
 package adapter;
-
 /**
  * The Target interface — what YOUR application's code expects.
  * Every payment gateway in your system must implement this.
- * Written to handle modern async-style payment flows.
  */
 public interface PaymentGateway {
     boolean charge(String customerId, double amount, String currency);