fix(adsense): Remove debug code after finding root cause

Root cause: mu-plugin allow-unfiltered-html.php was replacing all
filtered content with raw DB content at PHP_INT_MAX priority.

Solution: Modified mu-plugin on server to call roi_inject_content_ads()
after getting raw content.

NOTE: The mu-plugin change is only on the production server at:
/wp-content/mu-plugins/allow-unfiltered-html.php

The change adds roi_inject_content_ads() call after YouTube Facade filter.
This allows ads to be injected into posts even with the raw content bypass.

Cleaned up:
- Removed debug logging from adsense-placement.php
- Removed template-level debug from single.php
- Removed debug markers

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

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

single.php

@@ -39,18 +39,8 @@ if (function_exists('roi_render_component')) {
 
 			<!-- Post Content -->
 			<article class="post-content">
-				<!-- DEBUG: BEFORE the_content() -->
 				<?php
-				// DEBUG: Capturar output de the_content
-				ob_start();
 				the_content();
-				$captured_content = ob_get_clean();
-				// DEBUG: Log y output
-				if (defined('WP_DEBUG') && WP_DEBUG) {
-				    error_log('ROI DEBUG single.php: the_content() returned ' . strlen($captured_content) . ' chars');
-				    error_log('ROI DEBUG single.php: First 300 chars: ' . substr($captured_content, 0, 300));
-				}
-				echo $captured_content;
 
 				wp_link_pages(array(
 					'before' => '<div class="page-links">' . esc_html__('Pages:', 'roi-theme'),