fix(01-01): correct CPT registration hook timing

- CPT init hook was being added from within parent init hook
- Changed to call register_post_type() directly from main init
- Removed redundant hook from CPT constructor
- Fixes CPT not registering on plugin activation

umzugsliste.php

@@ -65,8 +65,9 @@ class Umzugsliste {
 	 * Initialize plugin components
 	 */
 	public function init() {
-		// Initialize CPT
-		Umzugsliste_CPT::get_instance();
+		// Initialize and register CPT
+		$cpt = Umzugsliste_CPT::get_instance();
+		$cpt->register_post_type();
 
 		// Initialize admin menu
 		if ( is_admin() ) {