[feat] add native iOS client support

ios/CrossDeskMobile/CrossDeskMobileApp.swift

@@ -0,0 +1,43 @@
+import SwiftUI
+import UIKit
+
+final class CrossDeskAppDelegate: NSObject, UIApplicationDelegate {
+    static var supportedOrientations: UIInterfaceOrientationMask = .portrait
+
+    func application(_ application: UIApplication,
+                     supportedInterfaceOrientationsFor window: UIWindow?)
+        -> UIInterfaceOrientationMask {
+        Self.supportedOrientations
+    }
+}
+
+enum AppOrientation {
+    static func update(to orientations: UIInterfaceOrientationMask) {
+        DispatchQueue.main.async {
+            CrossDeskAppDelegate.supportedOrientations = orientations
+
+            for case let scene as UIWindowScene in UIApplication.shared.connectedScenes {
+                scene.windows.forEach {
+                    $0.rootViewController?.setNeedsUpdateOfSupportedInterfaceOrientations()
+                }
+                scene.requestGeometryUpdate(
+                    .iOS(interfaceOrientations: orientations)
+                ) { error in
+                    NSLog("CrossDesk orientation update failed: %@", error.localizedDescription)
+                }
+            }
+        }
+    }
+}
+
+@main
+struct CrossDeskMobileApp: App {
+    @UIApplicationDelegateAdaptor(CrossDeskAppDelegate.self) private var appDelegate
+    @StateObject private var session = RemoteSessionModel()
+
+    var body: some Scene {
+        WindowGroup {
+            ContentView(session: session)
+        }
+    }
+}