StoreKit 2 In-App Purchases and Subscriptions

Implement in-app purchases, subscriptions, paywalls, and StoreKit testing using StoreKit 2. Use the modern Swift-based Product, Transaction, PurchaseAction, StoreView, and SubscriptionStoreView APIs. Avoid original In-App Purchase APIs (SKProduct, SKPaymentQueue) unless legacy OS support requires them.

StoreKit views initiate purchases automatically. For custom controls, use PurchaseAction in SwiftUI, purchase(confirmIn:options:) in UIKit/AppKit, and product.purchase(options:) on watchOS.

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