Backup antes de optimizar Bootstrap Icons (subset)

Estado actual:
- Bootstrap Icons completo: 211 KB (2050 iconos)
- Solo usamos 105 iconos (5.1%)

Próximo paso: crear subset de iconos para ahorrar ~199 KB

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

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

Admin/Shared/Infrastructure/FieldMapping/FieldMapperProvider.php

@@ -32,6 +32,7 @@ final class FieldMapperProvider
         'ContactForm',
         'Footer',
         'ThemeSettings',
+        'AdsensePlacement',
     ];
 
     public function __construct(