fix: iOS静音模式无声

ios/Runner/AppDelegate.swift

@@ -1,5 +1,6 @@
 import UIKit
 import Flutter
+import AVFoundation
 
 @UIApplicationMain
 @objc class AppDelegate: FlutterAppDelegate {
@@ -8,6 +9,14 @@ import Flutter
     didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
   ) -> Bool {
     GeneratedPluginRegistrant.register(with: self)
+    
+    // 设置音频会话类别，确保在静音模式下播放音频
+    do {
+      try AVAudioSession.sharedInstance().setCategory(.playback, options: [.duckOthers])
+    } catch {
+      print("Failed to set audio session category: \(error)")
+    }
+    
     return super.application(application, didFinishLaunchingWithOptions: launchOptions)
   }
-}
+}