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)

app/app.vue

@@ -1,4 +1,6 @@
 <script setup lang="ts">
+import { killianPerson } from '~/utils/seo-person'
+
 const { locale } = useI18n()
 const head = useLocaleHead({ seo: true })
 
@@ -7,6 +9,14 @@ useHead({
   link: computed(() => head.value.link || []),
   meta: computed(() => head.value.meta || []),
 })
+
+useSchemaOrg([
+  definePerson(killianPerson),
+  defineWebSite({
+    name: "Killian' Dal-Cin — Hytale Plugin Developer",
+    inLanguage: ['fr-FR', 'en-US'],
+  }),
+])
 </script>
 
 <template>