chore: update kirby-seo plugin to v2.0.0-alpha.12

Update plugin from v1.1.2 to v2.0.0-alpha.12 for Kirby 5 compatibility.

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

site/plugins/kirby-seo/blueprints/fields/social-media.php

@@ -0,0 +1,30 @@
+<?php
+
+/**
+ * Social Media Accounts field
+ * Allows social media account list to be filled by config options
+ */
+
+use tobimori\Seo\Seo;
+
+return function () {
+	$fields = [];
+
+	foreach (Seo::option('socialMedia') as $key => $value) {
+		if ($value) {
+			$fields[$key] = [
+				'label' => ucfirst($key),
+				'type' => 'url',
+				'icon' => strtolower($key),
+				'placeholder' => $value
+			];
+		}
+	}
+
+	return [
+		'label' => 'seo.fields.socialMediaAccounts.label',
+		'type' => 'object',
+		'help' => 'seo.fields.socialMediaAccounts.help',
+		'fields' => $fields
+	];
+};