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>

Public/AdsensePlacement/Infrastructure/Ui/AdsensePlacementRenderer.php

@@ -59,12 +59,14 @@ final class AdsensePlacementRenderer
 
         // 4. Generar CSS (usando CSSGeneratorService)
         $css = $this->cssGenerator->generate(
-            ".roi-ad-{$location}",
+            ".roi-ad-slot",
             [
-                'display' => 'flex',
-                'justify_content' => 'center',
-                'margin_top' => '1rem',
-                'margin_bottom' => '1rem',
+                'display' => 'block',
+                'width' => '100%',
+                'min_width' => '300px',
+                'margin_top' => '1.5rem',
+                'margin_bottom' => '1.5rem',
+                'text_align' => 'center',
             ]
         );