feat(api): add spam content detection for forms

- Add SpamDetectionService to detect gibberish/random text
- Detect excessive consonants, low vowel ratio, mixed case patterns
- Detect repeated characters and extremely long words
- Validate names look realistic (start with letter, have vowels)
- Cross-validate multiple suspicious fields
- Integrate with ContactFormAjaxHandler and NewsletterAjaxHandler
- Log blocked attempts to debug.log

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

functions.php

@@ -146,17 +146,22 @@ try {
     // Obtener servicio de validacion reCAPTCHA para inyectar en handlers
     $recaptchaService = $container->getRecaptchaValidationService();
 
+    // Crear servicio de deteccion de spam para validar contenido
+    $spamDetectionService = new \ROITheme\Shared\Application\Services\SpamDetectionService();
+
     // Crear y registrar el handler AJAX para el Contact Form (público)
     $contactFormAjaxHandler = new \ROITheme\Public\ContactForm\Infrastructure\Api\WordPress\ContactFormAjaxHandler(
         $container->getComponentSettingsRepository(),
-        $recaptchaService
+        $recaptchaService,
+        $spamDetectionService
     );
     $contactFormAjaxHandler->register();
 
     // Crear y registrar el handler AJAX para Newsletter (público)
     $newsletterAjaxHandler = new \ROITheme\Public\Footer\Infrastructure\Api\WordPress\NewsletterAjaxHandler(
         $container->getComponentSettingsRepository(),
-        $recaptchaService
+        $recaptchaService,
+        $spamDetectionService
     );
     $newsletterAjaxHandler->register();