[push/opt-in-prompts] Implement push notifications client integration

Build the full client half of docs/api/push-notifications-integration-guide.md:
OS permission + APNs device-token registration and pipeline wiring, profile
notifications/biometric-login toggles on the Ver Perfil screen reflecting
server truth, order-tracking opt-in fallback prompt, profile-cache refresh
on every mutation, a Notification Service Extension for rich/image push,
the Push Notifications capability, targeting-attributes sync, campaign open
tracking, and tap-to-order deep linking with foreground notification display.

Sources/PediFoods/Views/Main/CheckoutView+Logic.swift

@@ -80,6 +80,8 @@ extension CheckoutView {
                     appState.profile.phone = phoneNumber
                 }
                 appState.profile.profilePicture = customer.profilePicture ?? ""
+                appState.profile.notificationsEnabled = customer.notificationsEnabled ?? false
+                appState.profile.faceIdEnabled = customer.faceIdEnabled ?? false
                 SessionStateStore.setActiveUserKey(
                     SessionStateStore.makeUserKey(profileId: customer.id, email: customer.email)
                 )