feat: add VideoObject JSON-LD schema for video content

Outputs VideoObject structured data when an article has a video URL
set, enabling Google video rich results. Closes #67

source/packages/plg_system_mokoog/src/Extension/MokoOG.php

@@ -282,6 +282,14 @@ final class MokoOG extends CMSPlugin implements SubscriberInterface
                 $doc->addCustomTag(JsonLdBuilder::toScriptTag($schema));
             }
 
+            if (!empty($ogData->og_video)) {
+                $videoSchema = JsonLdBuilder::buildVideo($ogData->og_video, $title, $description, $imageUrl);
+
+                if ($videoSchema) {
+                    $doc->addCustomTag(JsonLdBuilder::toScriptTag($videoSchema));
+                }
+            }
+
             if ($this->params->get('jsonld_breadcrumbs', 1)) {
                 $breadcrumbs = JsonLdBuilder::buildBreadcrumbs();
 

source/packages/plg_system_mokoog/src/Helper/JsonLdBuilder.php

@@ -248,6 +248,40 @@ class JsonLdBuilder
         return $schema;
     }
 
+    /**
+     * Build VideoObject schema for pages with a video URL.
+     *
+     * @param   string  $videoUrl     Video URL (e.g. YouTube, Vimeo, or direct)
+     * @param   string  $title        Video title
+     * @param   string  $description  Video description
+     * @param   string  $imageUrl     Thumbnail image URL (absolute)
+     *
+     * @return  array|null
+     */
+    public static function buildVideo(string $videoUrl, string $title, string $description, string $imageUrl): ?array
+    {
+        if (empty($videoUrl)) {
+            return null;
+        }
+
+        $schema = [
+            '@context'     => 'https://schema.org',
+            '@type'        => 'VideoObject',
+            'name'         => $title,
+            'description'  => $description,
+            'thumbnailUrl' => $imageUrl,
+            'contentUrl'   => $videoUrl,
+            'uploadDate'   => Factory::getDate()->toISO8601(),
+        ];
+
+        // Add embedUrl for YouTube and Vimeo
+        if (preg_match('/youtube\.com|youtu\.be|vimeo\.com/i', $videoUrl)) {
+            $schema['embedUrl'] = $videoUrl;
+        }
+
+        return $schema;
+    }
+
     /**
      * Encode a schema array to a JSON-LD script tag string.
      *