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/site.php

@@ -0,0 +1,95 @@
+<?php
+
+use tobimori\Seo\Seo;
+
+return [
+	'label' => 'seo.tabs.seo',
+	'icon' => 'search',
+	'columns' => [
+		'main' => [
+			'width' => '7/12',
+			'fields' => [
+				'_metaHeadline' => [
+					'label' => 'seo.site.meta.headline',
+					'type' => 'headline',
+					'help' => 'seo.site.meta.headline.help'
+				],
+				'metaTemplate' => [
+					'extends' => 'seo/fields/title-template',
+					'label' => 'seo.fields.metaTitleTemplate.label',
+					'help' => 'seo.fields.metaTitleTemplate.help'
+				],
+				'metaDescription' => [
+					'label' => 'seo.fields.metaDescription.label',
+					'type' => 'seo-writer',
+					'ai' => 'site-description',
+					'help' => 'seo.fields.metaDescription.help'
+				],
+				'_seoLine1' => [
+					'type' => 'line'
+				],
+				'_ogHeadline' => [
+					'label' => 'seo.site.og.headline',
+					'type' => 'headline',
+					'numbered' => false,
+					'help' => 'seo.site.og.headline.help'
+				],
+				'ogTemplate' => [
+					'extends' => 'seo/fields/title-template',
+					'label' => 'seo.fields.ogTitleTemplate.label',
+					'default' => '{{ title }}',
+					'help' => 'seo.fields.metaTitleTemplate.help',
+					'placeholder' => '{{ site.metaTemplate }}'
+				],
+				'ogDescription' => [
+					'label' => 'seo.fields.ogDescription.label',
+					'type' => 'seo-writer',
+					'ai' => 'og-site-description',
+					'placeholder' => '{{ site.metaDescription }}'
+				],
+				'ogSiteName' => [
+					'label' => 'seo.fields.ogSiteName.label',
+					'type' => 'text',
+					'default' => '{{ site.title }}',
+					'placeholder' => '{{ site.title }}',
+					'width' => '1/2'
+				],
+				'ogImage' => [
+					'label' => 'seo.fields.ogImage.label',
+					'extends' => 'seo/fields/og-image',
+					'empty' => 'seo.fields.ogImage.empty',
+					'width' => '1/2'
+				],
+				'cropOgImage' => [
+					'label' => 'seo.fields.cropOgImage.label',
+					'type' => 'toggle',
+					'default' => true,
+					'text' => [
+						"{{ t('seo.common.no') }}",
+						"{{ t('seo.common.yes') }}"
+					],
+					'help' => 'seo.fields.cropOgImage.help'
+				],
+				'_seoLine2' => [
+					'type' => 'line'
+				],
+				'robots' => 'seo/fields/site-robots',
+				'socialMediaAccounts' => 'seo/fields/social-media'
+			]
+		],
+		'sidebar' => [
+			'width' => '5/12',
+			'sticky' => true,
+			'sections' => [
+				'seoPreview' => [
+					'type' => 'seo-preview'
+				],
+				...(Seo::option('searchConsole.enabled') ? [
+					'seoSearchConsole' => [
+						'type' => 'seo-search-console'
+					]
+				] : [])
+			]
+		]
+	]
+];