feat(payment): implement change payment method (PATCH /payment-method)

- ChangePaymentMethodPayload + ChangePaymentMethodResult models
- ApiService.changePaymentMethod()
- PixPaymentContext gains storeId + order data for payment switch
- PaymentPixView: Trocar button opens ChangePaymentSheet with 3 options
- ChangePaymentSheet: Novo PIX (new QR), Cartão (saved or new), Pagar na Entrega
- ChangePaymentCardSheet + ChangePaymentNewCardView with same card masks/validation
- OrdersView/OrderEntryDestinationView: threaded appState binding

pedi-foods/Sources/PediFoods/Views/Main/CheckoutView+Logic.swift

@@ -397,9 +397,24 @@ extension CheckoutView {
             ? pixFromPayment?.expirationDate : pixFromPayload?.expirationDate
 
         if let copyPaste, copyPaste.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty == false {
+            let itemsData = (try? JSONEncoder().encode(appState.cart.toOrderItemsPayload())).flatMap { String(data: $0, encoding: .utf8) } ?? "[]"
+            let storeId = appState.cart.storeId ?? ""
             pixPaymentContext = PixPaymentContext(
-                id: orderId, orderId: orderId, shortId: result.shortId,
-                copyPaste: copyPaste, qrCodeImageBase64: qrCodeImage, expirationDate: expirationDate
+                id: orderId,
+                orderId: orderId,
+                shortId: result.shortId,
+                storeId: storeId,
+                copyPaste: copyPaste,
+                qrCodeImageBase64: qrCodeImage,
+                expirationDate: expirationDate,
+                total: totalValue,
+                profileName: appState.profile.name,
+                profileEmail: appState.profile.email,
+                profilePhone: appState.profile.phone,
+                addressZip: selectedCustomerAddress?.zipCode,
+                addressNumber: selectedCustomerAddress?.number,
+                deliveryType: deliveryType.rawValue,
+                itemsJSON: itemsData
             )
             return
         }