fix: Opik autoloader gap — services/opik/ not scanned (v0.12.3)

class-autoloader.php listed services/ but not services/opik/. All four Opik classes live in that subdirectory. Composer classmap covered it (tests passed); WP runtime autoloader would fatal in production on first Opik class reference. Adds services/opik/ to the scan list. Bumps to v0.12.3.

includes/class-autoloader.php

@@ -30,6 +30,7 @@ class PRAutoBlogger_Autoloader {
 		'models/',
 		'frontend/',
 		'services/',
+		'services/opik/',
 		'ajax/',
 	);