feat(api): implement recaptcha v3 anti-spam protection

- Add RecaptchaValidatorInterface and RecaptchaResult entity in Domain
- Create RecaptchaValidationService in Application layer
- Implement GoogleRecaptchaValidator for API integration
- Add recaptcha-settings schema and admin FormBuilder
- Integrate reCAPTCHA validation in NewsletterAjaxHandler
- Integrate reCAPTCHA validation in ContactFormAjaxHandler
- Update FooterRenderer and ContactFormRenderer with reCAPTCHA scripts
- Configure DIContainer with RecaptchaValidationService injection

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Shared/Infrastructure/Di/DIContainer.php

@@ -48,6 +48,10 @@ use ROITheme\Shared\Domain\Contracts\PostGridShortcodeRendererInterface;
 use ROITheme\Shared\Infrastructure\Query\PostGridQueryBuilder;
 use ROITheme\Shared\Infrastructure\Ui\PostGridShortcodeRenderer;
 use ROITheme\Shared\Application\UseCases\RenderPostGrid\RenderPostGridUseCase;
+// reCAPTCHA Anti-spam System
+use ROITheme\Shared\Domain\Contracts\RecaptchaValidatorInterface;
+use ROITheme\Shared\Infrastructure\Services\GoogleRecaptchaValidator;
+use ROITheme\Shared\Application\Services\RecaptchaValidationService;
 
 /**
  * DIContainer - Contenedor de Inyección de Dependencias
@@ -542,4 +546,35 @@ final class DIContainer
         }
         return $this->instances['renderPostGridUseCase'];
     }
+
+    // ===============================
+    // reCAPTCHA Anti-spam System
+    // ===============================
+
+    /**
+     * Obtiene el validador de reCAPTCHA (comunicacion con API de Google)
+     */
+    public function getRecaptchaValidator(): RecaptchaValidatorInterface
+    {
+        if (!isset($this->instances['recaptchaValidator'])) {
+            $this->instances['recaptchaValidator'] = new GoogleRecaptchaValidator();
+        }
+        return $this->instances['recaptchaValidator'];
+    }
+
+    /**
+     * Obtiene el servicio de validacion reCAPTCHA
+     *
+     * Orquesta la validacion usando configuracion de BD
+     */
+    public function getRecaptchaValidationService(): RecaptchaValidationService
+    {
+        if (!isset($this->instances['recaptchaValidationService'])) {
+            $this->instances['recaptchaValidationService'] = new RecaptchaValidationService(
+                $this->getRecaptchaValidator(),
+                $this->getComponentSettingsRepository()
+            );
+        }
+        return $this->instances['recaptchaValidationService'];
+    }
 }