perf(fonts): Self-host Poppins fonts

- Add WOFF2 font files for Poppins (400, 500, 600, 700 weights)
- Create @font-face declarations in css-global-fonts.css
- Remove Google Fonts dependency from enqueue-scripts.php
- Remove preconnect hints for fonts.googleapis.com from seo.php

Benefits:
- Eliminates 36.2 kB external transfer from Google Fonts
- Improves GDPR compliance (no Google tracking)
- Reduces render-blocking requests
- Faster font loading from local server

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

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

inc/seo.php

@@ -113,19 +113,14 @@ function roi_seo_head_hooks() {
 }
 
 /**
- * Add prefetch hints for external resources
+ * ELIMINADO: roi_prefetch_external()
  *
- * Improves performance by preemptively connecting to external domains
- * commonly used in the theme (fonts, CDNs, etc.)
+ * Motivo: Fuentes Poppins ahora son self-hosted (Assets/fonts/)
+ * Ya no se necesita preconnect a Google Fonts
  *
- * @since 1.0.0
+ * @since 1.0.0 - Creado
+ * @since 1.1.0 - Eliminado (self-hosted fonts)
  */
-function roi_prefetch_external() {
-    // Google Fonts prefetch
-    echo '<link rel="preconnect" href="https://fonts.googleapis.com">' . "\n";
-    echo '<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>' . "\n";
-}
-add_action('wp_head', 'roi_prefetch_external', 1);
 
 /**
  * Open Graph support for Rank Math compatibility