App::uses('AppModel', 'CameraModel') tells CakePHP to look for AppModel
in a non-existent 'CameraModel' package. The correct second argument is
'Model', which points to app/Model/AppModel.php where the base class
actually lives.
This was likely a copy-paste error — every other model in the codebase
correctly uses App::uses('AppModel', 'Model'). The bug may go unnoticed
when another model loads AppModel first via CakePHP's autoloader, but
causes a fatal error if CameraModel is the first model resolved in a
request (e.g. hitting the camera models API endpoint directly).
