feat: integrate flutter_local_notifications for enhanced voice call notifications

- Added flutter_local_notifications dependency to manage notifications during voice calls.
- Implemented notification handling in VoiceCallService to update call status and manage user interactions.
- Enabled wake lock functionality to keep the screen on during calls and prevent audio interruptions.
- Updated AndroidManifest.xml to include necessary permissions for Bluetooth and foreground services.
- Enhanced notification actions to allow users to mute, unmute, or end calls directly from notifications.

android/app/src/main/AndroidManifest.xml

@@ -4,11 +4,15 @@
     <uses-permission android:name="android.permission.RECORD_AUDIO"/>
     <uses-permission android:name="android.permission.CAMERA"/>
     <!-- No broad media/storage permissions; use Android Photo Picker (API 33+) and SAF/share intents -->
-    
+
+    <!-- Bluetooth permissions for audio routing (Android 12+) -->
+    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" android:maxSdkVersion="32" />
+
     <!-- Background streaming permissions -->
     <uses-permission android:name="android.permission.WAKE_LOCK"/>
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_DATA_SYNC"/>
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_MICROPHONE"/>
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS"/>
     
     <queries>
@@ -88,7 +92,7 @@
             android:name=".BackgroundStreamingService"
             android:enabled="true"
             android:exported="false"
-            android:foregroundServiceType="dataSync"/>
+            android:foregroundServiceType="dataSync|microphone"/>
         
         <!-- Don't delete the meta-data below.
              This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->