feat: intégration plugin Kirby SEO

- Ajout de tobimori/kirby-seo via Composer
- snippet('seo/head') dans header.php (remplace les meta manuels)
- snippet('seo/schemas') dans footer.php pour JSON-LD
- Onglet SEO ajouté dans site.yml et tous les blueprints de pages
- Configuration SEO dans config.php (sitemap, robots, canonicalBase TODO)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

site/plugins/kirby-seo/blueprints/fields/site-robots.php

@@ -0,0 +1,49 @@
+<?php
+
+use Kirby\Cms\App;
+
+return function (App $kirby) {
+	if (!$kirby->option('tobimori.seo.robots.active') || !$kirby->option('tobimori.seo.robots.pageSettings')) {
+		return [
+			'type' => 'hidden'
+		];
+	}
+
+	$fields = [
+		'_robotsHeadline' => [
+			'label' => 'seo.fields.robots.label',
+			'type' => 'headline',
+			'numbered' => false,
+		]
+	];
+
+	foreach ($kirby->option('tobimori.seo.robots.types') as $robots) {
+		$index = $kirby->option('tobimori.seo.robots.index');
+		if (is_callable($index)) {
+			$index = $index();
+		}
+
+		$fields["robots{$robots}"] = [
+			'label' =>  "seo.fields.robots.{$robots}.label",
+			'type' => 'toggles',
+			'help' => "seo.fields.robots.{$robots}.help",
+			'width' => '1/2',
+			'default' => 'default',
+			'reset' => false,
+			'options' => [
+				'default' => t('seo.common.default') . ' ' . ($index ? t('seo.common.yes') : t('seo.common.no')),
+				'true' => t('seo.common.yes'),
+				'false' => t('seo.common.no'),
+			]
+		];
+	}
+
+	$fields['_seoLine3'] = [
+		'type' => 'line'
+	];
+
+	return [
+		'type' => 'group',
+		'fields' => $fields,
+	];
+};