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>

Admin/RecaptchaSettings/Infrastructure/FieldMapping/RecaptchaSettingsFieldMapper.php

@@ -0,0 +1,42 @@
+<?php
+declare(strict_types=1);
+
+namespace ROITheme\Admin\RecaptchaSettings\Infrastructure\FieldMapping;
+
+use ROITheme\Admin\Shared\Domain\Contracts\FieldMapperInterface;
+
+/**
+ * Field Mapper para reCAPTCHA Settings
+ *
+ * RESPONSABILIDAD:
+ * - Mapear field IDs del formulario a atributos de BD
+ * - Solo conoce sus propios campos (modularidad)
+ *
+ * @package ROITheme\Admin\RecaptchaSettings\Infrastructure\FieldMapping
+ */
+final class RecaptchaSettingsFieldMapper implements FieldMapperInterface
+{
+    public function getComponentName(): string
+    {
+        return 'recaptcha-settings';
+    }
+
+    public function getFieldMapping(): array
+    {
+        return [
+            // Visibility
+            'recaptchaIsEnabled' => ['group' => 'visibility', 'attribute' => 'is_enabled'],
+
+            // Credentials
+            'recaptchaSiteKey' => ['group' => 'credentials', 'attribute' => 'site_key'],
+            'recaptchaSecretKey' => ['group' => 'credentials', 'attribute' => 'secret_key'],
+
+            // Behavior
+            'recaptchaScoreThreshold' => ['group' => 'behavior', 'attribute' => 'score_threshold'],
+            'recaptchaActionNewsletter' => ['group' => 'behavior', 'attribute' => 'action_newsletter'],
+            'recaptchaActionContact' => ['group' => 'behavior', 'attribute' => 'action_contact'],
+            'recaptchaFailOpen' => ['group' => 'behavior', 'attribute' => 'fail_open'],
+            'recaptchaLogBlocked' => ['group' => 'behavior', 'attribute' => 'log_blocked'],
+        ];
+    }
+}