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>

vendor/composer/installed.php

@@ -3,7 +3,7 @@
         'name' => 'getkirby/plainkit',
         'pretty_version' => 'dev-main',
         'version' => 'dev-main',
-        'reference' => '3cafcf3167251bbbfd64183de5da67c4a488fa7d',
+        'reference' => 'baab2fb3a185748e0bcff713054202f27b550ac6',
         'type' => 'project',
         'install_path' => __DIR__ . '/../../',
         'aliases' => array(),
@@ -67,7 +67,7 @@
         'getkirby/plainkit' => array(
             'pretty_version' => 'dev-main',
             'version' => 'dev-main',
-            'reference' => '3cafcf3167251bbbfd64183de5da67c4a488fa7d',
+            'reference' => 'baab2fb3a185748e0bcff713054202f27b550ac6',
             'type' => 'project',
             'install_path' => __DIR__ . '/../../',
             'aliases' => array(),
@@ -193,5 +193,14 @@
             'aliases' => array(),
             'dev_requirement' => false,
         ),
+        'tobimori/kirby-seo' => array(
+            'pretty_version' => '2.0.0-beta.3',
+            'version' => '2.0.0.0-beta3',
+            'reference' => 'c16472022f53eba9c58ec73b10926129f889f86d',
+            'type' => 'kirby-plugin',
+            'install_path' => __DIR__ . '/../../site/plugins/kirby-seo',
+            'aliases' => array(),
+            'dev_requirement' => false,
+        ),
     ),
 );