fix(di): declare $container as global before assignment

The $container variable was being assigned inside a try-catch block
without being declared as global first, making it unavailable to
Inc/adsense-placement.php functions. This caused AdSense slots to
not be injected into the content.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

functions.php

@@ -63,6 +63,9 @@ require_once get_template_directory() . '/Inc/social-share.php';
 
 use ROITheme\Shared\Infrastructure\Di\DIContainer;
 
+// Declarar $container como global para que esté disponible en Inc/*.php
+global $container;
+
 try {
     global $wpdb;