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>

Inc/adsense-placement.php

@@ -194,3 +194,65 @@ function roi_enqueue_adsense_script(): void
     }
 }
 add_action('wp_head', 'roi_enqueue_adsense_script', 5);
+
+/**
+ * Registra el filtro the_content para inyectar anuncios
+ */
+add_filter('the_content', 'roi_inject_content_ads', 100);
+
+function roi_inject_content_ads(string $content): string
+{
+    global $container;
+
+    // Solo en posts individuales
+    if (!is_single() || !in_the_loop() || !is_main_query()) {
+        return $content;
+    }
+
+    if ($container === null) {
+        return $content;
+    }
+
+    try {
+        $repository = $container->getComponentSettingsRepository();
+        $settings = $repository->getComponentSettings('adsense-placement');
+
+        if (empty($settings) || !($settings['visibility']['is_enabled'] ?? false)) {
+            return $content;
+        }
+
+        // Verificar exclusiones
+        if (roi_is_ad_excluded($settings)) {
+            return $content;
+        }
+
+        $renderer = $container->getAdsensePlacementRenderer();
+
+        // Inyectar anuncio al inicio (post-top)
+        $postTopHtml = '';
+        if ($settings['behavior']['post_top_enabled'] ?? false) {
+            $postTopHtml = $renderer->renderSlot($settings, 'post-top');
+        }
+
+        // Inyectar anuncio al final (post-bottom)
+        $postBottomHtml = '';
+        if ($settings['behavior']['post_bottom_enabled'] ?? false) {
+            $postBottomHtml = $renderer->renderSlot($settings, 'post-bottom');
+        }
+
+        // Inyectar anuncios dentro del contenido
+        $injector = new \ROITheme\Public\AdsensePlacement\Infrastructure\Services\ContentAdInjector(
+            $settings,
+            $renderer
+        );
+        $content = $injector->inject($content);
+
+        return $postTopHtml . $content . $postBottomHtml;
+
+    } catch (\Throwable $e) {
+        if (defined('WP_DEBUG') && WP_DEBUG) {
+            error_log('ROI AdSense Content: ' . $e->getMessage());
+        }
+        return $content;
+    }
+}