feat: enhance background streaming handler with microphone support

- Updated BackgroundStreamingHandler to include microphone permission handling for background execution.
- Modified startBackgroundExecution method to accept a requiresMicrophone parameter, allowing dynamic management of streams requiring microphone access.
- Adjusted service intent to pass microphone requirement status, improving service behavior based on app state.
- Enhanced VoiceCallService to utilize the new microphone support during voice call streaming, ensuring proper resource management.

lib/core/services/background_streaming_handler.dart

@@ -61,7 +61,10 @@ class BackgroundStreamingHandler {
   }
 
   /// Start background execution for given stream IDs
-  Future<void> startBackgroundExecution(List<String> streamIds) async {
+  Future<void> startBackgroundExecution(
+    List<String> streamIds, {
+    bool requiresMicrophone = false,
+  }) async {
     if (!Platform.isIOS && !Platform.isAndroid) return;
 
     _activeStreamIds.addAll(streamIds);
@@ -69,6 +72,7 @@ class BackgroundStreamingHandler {
     try {
       await _channel.invokeMethod('startBackgroundExecution', {
         'streamIds': streamIds,
+        'requiresMicrophone': requiresMicrophone,
       });
 
       DebugLogger.stream(