fix: add import AppKit for NSWorkspace in AudioRecorder, SonioxClient, and PingMonitor

src/AudioRecorder.swift

@@ -1,4 +1,5 @@
 import Foundation
+import AppKit
 import AVFoundation
 import CoreMedia
 

src/PingMonitor.swift

@@ -1,4 +1,5 @@
 import Foundation
+import AppKit
 
 public enum PingQuality {
     case good(ms: Int)          // < 450 ms -> Emerald Green

src/SonioxClient.swift

@@ -1,4 +1,5 @@
 import Foundation
+import AppKit
 
 public final class SonioxLiveSession {
     public static let primaryWsBase = "wss://translate.compare.soniox.com/compare/api/compare-websocket"