Add QR scanner support for macOS with camera selection

- Refactor QR scanner into separate Scanner module for iOS and macOS
- Add camera selection menu for devices with multiple cameras
- Use Vision framework for QR detection on macOS
- Remove tvOS QR scanner support (continuity camera)
- Add camera entitlement and usage description for macOS
- Fix minor issues in Intents and ExtensionProvider

Library/Network/ExtensionPlatformInterface.swift

@@ -249,7 +249,8 @@ public class ExtensionPlatformInterface: NSObject, LibboxPlatformInterfaceProtoc
 
     private func onUpdateDefaultInterface(_ listener: LibboxInterfaceUpdateListenerProtocol, _ path: Network.NWPath) {
         guard path.status != .unsatisfied,
-              let defaultInterface = path.availableInterfaces.first else {
+              let defaultInterface = path.availableInterfaces.first
+        else {
             listener.updateDefaultInterface("", interfaceIndex: -1, isExpensive: false, isConstrained: false)
             return
         }

Library/Network/ExtensionProvider.swift

@@ -13,7 +13,7 @@ open class ExtensionProvider: NEPacketTunnelProvider {
     private var commandServer: LibboxCommandServer!
     private var platformInterface: ExtensionPlatformInterface!
 
-    override open func startTunnel(options startOptions: [String: NSObject]?) async throws {
+    override open func startTunnel(options _: [String: NSObject]?) async throws {
         let options = LibboxSetupOptions()
         options.basePath = FilePath.sharedDirectory.relativePath
         options.workingPath = FilePath.workingDirectory.relativePath