perf: defer style.css - eliminate last render-blocking CSS

- Add site structure, accessibility, typography to critical-bootstrap.css
- Defer roi-main-style (style.css) with media='print'
- Goal: 0 blocking CSS files (was 1 file, 19KB)

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

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

Inc/enqueue-scripts.php

@@ -29,6 +29,7 @@ define('ROI_DEFERRED_CSS', [
     'roi-fonts',      // @font-face inline en critical-bootstrap.css
     'roi-bootstrap',  // Critical inline via CriticalBootstrapService
     'roi-variables',  // Variables ahora inline en critical CSS
+    'roi-main-style', // Critical base inline via CriticalBootstrapService
     // Componentes específicos (below the fold)
     'roi-badges',
     'roi-pagination',
@@ -178,8 +179,8 @@ function roi_enqueue_main_stylesheet() {
         'roi-main-style',
         get_template_directory_uri() . '/Assets/css/style.css',
         array('roi-variables'),
-        '1.0.5', // Arquitectura: Separación de responsabilidades CSS
-        'all'
+        '1.0.6', // DIFERIDO - critical base inline via CriticalBootstrapService
+        'print' // DIFERIDO - media='print' → onload="this.media='all'"
     );
 }