refactor(frontend): move detail view state initialization to server plugin

Remove top-level await from useAsyncData in detail views
Remove manual state initialization blocks in components
Introduce 03-detail-seo.server.ts to handle SEO and state

frontend/plugins/03-detail-seo.server.ts

@@ -0,0 +1,76 @@
+import { resolvedSeoHead, resolveSeo, type SeoConfig } from '../src/seo';
+import { api } from '../src/services/api';
+
+export default defineNuxtPlugin(async () => {
+  const route = useRoute();
+  const routeId = typeof route.params.id === 'string' && route.params.id.trim() !== '' ? route.params.id : null;
+  if (!routeId || typeof route.name !== 'string') {
+    return;
+  }
+
+  const nuxtApp = useNuxtApp();
+  const t = (nuxtApp.$pokopiaI18n as { global: { t: (key: string, values?: Record<string, string | number>) => string } }).global.t;
+  const seo = await detailSeo(String(route.name), routeId, t);
+  if (seo) {
+    useHead(resolvedSeoHead(resolveSeo(seo)));
+  }
+});
+
+async function detailSeo(
+  routeName: string,
+  routeId: string,
+  t: (key: string, values?: Record<string, string | number>) => string
+): Promise<SeoConfig | null> {
+  try {
+    if (routeName === 'pokemon-detail') {
+      const pokemon = await api.pokemonDetail(routeId);
+      return {
+        title: `${pokemon.name} - ${t(pokemon.isEventItem ? 'pages.eventPokemon.title' : 'pages.pokemon.title')}`,
+        description: t('seo.pokemonDetailDescription', { name: pokemon.name }),
+        canonicalPath: `/pokemon/${pokemon.id}`,
+        image: pokemon.image?.url
+      };
+    }
+
+    if (routeName === 'habitat-detail') {
+      const habitat = await api.habitatDetail(routeId);
+      return {
+        title: `${habitat.name} - ${t(habitat.isEventItem ? 'pages.eventHabitats.title' : 'pages.habitats.title')}`,
+        description: t('seo.habitatDetailDescription', { name: habitat.name }),
+        canonicalPath: `/habitats/${habitat.id}`,
+        image: habitat.image?.url
+      };
+    }
+
+    if (routeName === 'item-detail' || routeName === 'ancient-artifact-detail') {
+      const item = await api.itemDetail(routeId);
+      const ancientArtifactRoute = routeName === 'ancient-artifact-detail';
+      if (ancientArtifactRoute && !item.ancientArtifactCategory) {
+        return null;
+      }
+
+      const titleKey = ancientArtifactRoute ? 'pages.ancientArtifacts.title' : item.isEventItem ? 'pages.eventItems.title' : 'pages.items.title';
+      const descriptionKey = ancientArtifactRoute ? 'seo.ancientArtifactDetailDescription' : 'seo.itemDetailDescription';
+      return {
+        title: `${item.name} - ${t(titleKey)}`,
+        description: t(descriptionKey, { name: item.name }),
+        canonicalPath: ancientArtifactRoute ? `/ancient-artifacts/${item.id}` : `/items/${item.id}`,
+        image: item.image?.url
+      };
+    }
+
+    if (routeName === 'recipe-detail') {
+      const recipe = await api.recipeDetail(routeId);
+      return {
+        title: `${recipe.name} - ${t('pages.recipes.title')}`,
+        description: t('seo.recipeDetailDescription', { name: recipe.name }),
+        canonicalPath: `/recipes/${recipe.id}`,
+        image: recipe.item.image?.url
+      };
+    }
+  } catch {
+    return null;
+  }
+
+  return null;
+}