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/OrdersView.swift

@@ -1,6 +1,7 @@
 import SwiftUI
 
 struct OrdersView: View {
+    @Binding var appState: AppState
     @Environment(\.dismiss) var dismiss
     @State var isLoading = false
     @State var errorMessage: String? = nil
@@ -58,7 +59,8 @@ struct OrdersView: View {
                 initialShortId: context.shortId,
                 fallbackPaymentMethod: context.paymentMethod,
                 fallbackTotal: context.total,
-                routeIntent: context.intent
+                routeIntent: context.intent,
+                appState: $appState
             )
         }
     }
@@ -629,6 +631,7 @@ struct OrderEntryDestinationView: View {
     let fallbackPaymentMethod: String?
     let fallbackTotal: Double?
     let routeIntent: OrderRouteIntent
+    @Binding var appState: AppState
 
     @State var isResolvingRoute = true
     @State var didResolve = false
@@ -650,6 +653,7 @@ struct OrderEntryDestinationView: View {
             } else if let pixContext {
                 PaymentPixView(
                     context: pixContext,
+                    appState: $appState,
                     onPaymentConfirmed: {
                         orderTrackingContext = OrderTrackingContext(orderId: pixContext.orderId, shortId: pixContext.shortId)
                     },
@@ -701,15 +705,25 @@ struct OrderEntryDestinationView: View {
                 let expirationDate = (pixFromPayment?.expirationDate?.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty == false)
                     ? pixFromPayment?.expirationDate
                     : pixFromPayload?.expirationDate
+                let storeId = order.storeId ?? ""
                 pixContext = PixPaymentContext(
                     id: order.id,
                     orderId: order.id,
                     shortId: order.shortId ?? initialShortId,
+                    storeId: storeId,
                     copyPaste: copyPaste?.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty == false
                         ? (copyPaste ?? "")
                         : "Código PIX indisponível no momento. Aguarde e tente novamente.",
                     qrCodeImageBase64: qrCodeImage,
-                    expirationDate: expirationDate
+                    expirationDate: expirationDate,
+                    total: order.total ?? 0,
+                    profileName: "",
+                    profileEmail: "",
+                    profilePhone: "",
+                    addressZip: nil,
+                    addressNumber: nil,
+                    deliveryType: order.deliveryType ?? "DELIVERY",
+                    itemsJSON: "[]"
                 )
                 return
             }