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/config/options/ai.php

@@ -0,0 +1,39 @@
+<?php
+
+use tobimori\Seo\Ai\Drivers\Anthropic;
+use tobimori\Seo\Ai\Drivers\Gemini;
+use tobimori\Seo\Ai\Drivers\OpenAi;
+
+// TODO: custom provider per task
+return [
+	'enabled' => true,
+	'provider' => 'openai',
+	'providers' => [
+		'openai' => [
+			'driver' => OpenAi::class,
+			'config' => [
+				'apiKey' => '', // needs to be defined
+			],
+		],
+		'anthropic' => [
+			'driver' => Anthropic::class,
+			'config' => [
+				'apiKey' => '', // needs to be defined
+			],
+		],
+		'gemini' => [
+			'driver' => Gemini::class,
+			'config' => [
+				'apiKey' => '', // needs to be defined
+			],
+		],
+		'openrouter' => [
+			'driver' => OpenAi::class,
+			'config' => [
+				'apiKey' => '', // needs to be defined
+				'model' => 'openai/gpt-5-nano',
+				'endpoint' => 'https://openrouter.ai/api/v1/responses',
+			],
+		],
+	],
+];