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/user/serializers.py

@@ -0,0 +1,71 @@
+"""User serializers"""
+
+from rest_framework import serializers
+from user.models import Account
+
+
+class AccountSerializer(serializers.ModelSerializer):
+    """Account serializer"""
+    avatar_url = serializers.SerializerMethodField()
+
+    class Meta:
+        model = Account
+        fields = [
+            'id', 'username', 'email', 'date_joined', 'last_login', 
+            'two_factor_enabled', 'avatar', 'avatar_url',
+            'is_admin', 'is_superuser', 'is_staff',
+            'storage_quota_gb', 'storage_used_gb', 
+            'max_channels', 'max_playlists'
+        ]
+        read_only_fields = [
+            'id', 'date_joined', 'last_login', 'two_factor_enabled', 'avatar_url',
+            'is_admin', 'is_superuser', 'is_staff',
+            'storage_used_gb'
+        ]
+    
+    def get_avatar_url(self, obj):
+        """Get avatar URL"""
+        if not obj.avatar:
+            return None
+        
+        # Preset avatars (served from frontend public folder)
+        if obj.avatar.startswith('preset_'):
+            return f"/avatars/{obj.avatar}.svg"
+        
+        # Custom avatars (served from backend)
+        return f"/api/user/avatar/file/{obj.avatar.split('/')[-1]}/"
+
+
+class LoginSerializer(serializers.Serializer):
+    """Login serializer"""
+    username = serializers.CharField()
+    password = serializers.CharField(write_only=True)
+    two_factor_code = serializers.CharField(required=False, allow_blank=True)
+
+
+class UserConfigSerializer(serializers.Serializer):
+    """User configuration serializer"""
+    theme = serializers.CharField(default='dark')
+    items_per_page = serializers.IntegerField(default=50)
+    audio_quality = serializers.ChoiceField(
+        choices=['low', 'medium', 'high', 'best'],
+        default='best'
+    )
+
+
+class TwoFactorSetupSerializer(serializers.Serializer):
+    """2FA setup response"""
+    secret = serializers.CharField()
+    qr_code = serializers.CharField()
+    backup_codes = serializers.ListField(child=serializers.CharField())
+
+
+class TwoFactorVerifySerializer(serializers.Serializer):
+    """2FA verification"""
+    code = serializers.CharField(min_length=6, max_length=6)
+
+
+class TwoFactorStatusSerializer(serializers.Serializer):
+    """2FA status"""
+    enabled = serializers.BooleanField()
+    backup_codes_count = serializers.IntegerField()