feat(07-01): wire global schema.org Person + WebSite and sitemap sources

- nuxt.config.ts: register 'nuxt-schema-org' module + sitemap.sources=['/api/__sitemap__/urls']
- app/utils/seo-person.ts: KILLIAN_PERSON_ID + killianPerson (derived from siteConfig, email excluded)
- app/app.vue: useSchemaOrg([definePerson(killianPerson), defineWebSite({name, inLanguage})]) appended (D-12)
- Verified SSR: /fr emits JSON-LD Person @id=#killian + WebSite (curl, pas d'hydratation)

nuxt.config.ts

@@ -9,6 +9,7 @@ export default defineNuxtConfig({
     '@nuxt/eslint',
     '@nuxtjs/i18n',
     '@nuxtjs/sitemap',
+    'nuxt-schema-org',
     'nuxt-gtag',
   ],
   components: [
@@ -31,6 +32,9 @@ export default defineNuxtConfig({
     url: 'https://killiandalcin.fr',
     name: "Killian' DAL-CIN - Developpeur Full Stack",
   },
+  sitemap: {
+    sources: ['/api/__sitemap__/urls'],
+  },
   i18n: {
     strategy: 'prefix',
     defaultLocale: 'fr',