feat(pagespeed): implement YouTube Facade Pattern - Phase 2.4

PageSpeed Optimization to reduce TBT by ~2000ms:
- Add YoutubeFacade module following Clean Architecture
- Replace YouTube iframes with thumbnail + play button
- Load real iframe only on user click (lazy-load)
- Reduces initial page blocking time significantly

Files added:
- Public/YoutubeFacade/Infrastructure/Wordpress/YoutubeFacadeHooksRegistrar.php
- Public/YoutubeFacade/Infrastructure/Services/YoutubeFacadeContentFilter.php
- Public/YoutubeFacade/Infrastructure/Ui/YoutubeFacadeRenderer.php
- Public/YoutubeFacade/Infrastructure/Ui/Assets/Css/youtube-facade.css
- Public/YoutubeFacade/Infrastructure/Ui/Assets/Js/youtube-facade.js

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

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

functions.php

@@ -156,6 +156,17 @@ try {
     );
     $themeSettingsInjector->register();
 
+    // === YOUTUBE FACADE (PageSpeed Optimization Phase 2.4) ===
+    // Lazy-load YouTube iframes to reduce TBT by ~2000ms
+    $youtubeFacadeRenderer = new \ROITheme\Public\YoutubeFacade\Infrastructure\Ui\YoutubeFacadeRenderer();
+    $youtubeFacadeFilter = new \ROITheme\Public\YoutubeFacade\Infrastructure\Services\YoutubeFacadeContentFilter(
+        $youtubeFacadeRenderer
+    );
+    $youtubeFacadeHooksRegistrar = new \ROITheme\Public\YoutubeFacade\Infrastructure\Wordpress\YoutubeFacadeHooksRegistrar(
+        $youtubeFacadeFilter
+    );
+    $youtubeFacadeHooksRegistrar->register();
+
     // Log en modo debug
     if (defined('WP_DEBUG') && WP_DEBUG) {
         error_log('ROI Theme: Admin Panel initialized successfully');