Player Stats Retrieve

Mixin to handle profile_picture serialization for WebSocket compatibility. This mixin adds a SerializerMethodField for profile_picture that converts ImageFieldFile objects to URL strings, making them JSON serializable for WebSocket consumers. The mixin intelligently handles profile pictures from IAMUserDetail by: 1. Accessing the related `details` queryset on the IAMUser model 2. Extracting the ImageFieldFile from the first detail record 3. Converting it to a URL string for JSON serialization Usage: ```python class MyUserSerializer(ProfilePictureMixin, serializers.ModelSerializer): class Meta: model = User fields = ['id', 'username', 'profile_picture', ...] ``` Note: - This mixin expects the model to have a `details` related manager - The related detail should have a `profile_picture` ImageField - Returns None if no profile picture is found or an error occurs