Initial commit - SoundWave v1.0

- Full PWA support with offline capabilities
- Comprehensive search across songs, playlists, and channels
- Offline playlist manager with download tracking
- Pre-built frontend for zero-build deployment
- Docker-based deployment with docker compose
- Material-UI dark theme interface
- YouTube audio download and management
- Multi-user authentication support

backend/common/serializers.py

@@ -0,0 +1,16 @@
+"""Common serializers"""
+
+from rest_framework import serializers
+
+
+class ErrorResponseSerializer(serializers.Serializer):
+    """Error response"""
+    error = serializers.CharField()
+    details = serializers.DictField(required=False)
+
+
+class AsyncTaskResponseSerializer(serializers.Serializer):
+    """Async task response"""
+    task_id = serializers.CharField()
+    message = serializers.CharField()
+    status = serializers.CharField()