fix(adsense): registrar filtro the_content y corregir ancho de contenedor

- Registra filtro the_content para inyectar anuncios (post-top, post-bottom, content)
- Corrige CSS del contenedor .roi-ad-slot con width:100% para evitar availableWidth=0
- Usa ContentAdInjector para insertar ads dentro del contenido

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

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

Admin/AdsensePlacement/Infrastructure/FieldMapping/AdsensePlacementFieldMapper.php

@@ -3,11 +3,11 @@ declare(strict_types=1);
 
 namespace ROITheme\Admin\AdsensePlacement\Infrastructure\FieldMapping;
 
-use ROITheme\Admin\Shared\Infrastructure\FieldMapping\FieldMapperInterface;
+use ROITheme\Admin\Shared\Domain\Contracts\FieldMapperInterface;
 
 final class AdsensePlacementFieldMapper implements FieldMapperInterface
 {
-    public function getComponentId(): string
+    public function getComponentName(): string
     {
         return 'adsense-placement';
     }