Package-level declarations

Java-friendly async facade for RoutexClient: every public method is exposed here as an instance method returning CompletableFuture. Kotlin callers should use RoutexClient directly; this class is intended for Java consumers and other JVM languages that integrate with CompletableFuture.

Kotlin client for the YAXI Open Banking interactive services: accounts, balances, collectPayment, transactions, transfer, plus the discovery endpoints info and search.