fix: add services/opik/ to autoloader directory scan

The WordPress runtime autoloader (class-autoloader.php) was not scanning
services/opik/ — only services/. All four Opik classes live in that
subdirectory and would fatal on first use in production (class not found).

Composer's classmap covers all of includes/ recursively, so PHPUnit tests
passed. The runtime autoloader only scans explicit directory entries.

Adds 'services/opik/' to the scan list. No other services/ subdirs exist.

includes/class-autoloader.php

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