working media player in ios and android

Co-authored-by: Copilot <copilot@github.com>

ios/Runner/AppDelegate.swift

@@ -1,5 +1,6 @@
 import Flutter
 import UIKit
+import AVFoundation
 
 @main
 @objc class AppDelegate: FlutterAppDelegate, FlutterImplicitEngineDelegate {
@@ -7,6 +8,15 @@ import UIKit
     _ application: UIApplication,
     didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
   ) -> Bool {
+    // Ensure iOS uses the playback category so lock screen / Control Center
+    // media controls remain available during background audio.
+    do {
+      try AVAudioSession.sharedInstance().setCategory(.playback, mode: .default, options: [.allowAirPlay])
+      try AVAudioSession.sharedInstance().setActive(true)
+    } catch {
+      NSLog("Failed to configure AVAudioSession: \(error)")
+    }
+
     return super.application(application, didFinishLaunchingWithOptions: launchOptions)
   }