You need a module bootstrap class at application/modules/systems/Bootstrap.php
which extends Zend_Application_Module_Bootstrap
. This will setup module autoloading. Also your module folder should be lowercase - application/modules/systems
.
The module resource needs to have run before your _initRegistry
method in the main bootstrap file, so change the first line of that method to:
$this->bootstrap(array('db', 'modules'));
Everything else looks good.