refactor(frontend): migrate from Vite to Nuxt SPA

Replace Vite and Vue Router with Nuxt framework
Update Docker, build scripts, and env vars for Nuxt generate

frontend/server/utils/seo-files.ts

@@ -0,0 +1,68 @@
+const fallbackSiteUrl = 'https://pokopiawiki.tootaio.com';
+
+const sitemapPaths = [
+  '/pokemon',
+  '/event-pokemon',
+  '/habitats',
+  '/event-habitats',
+  '/items',
+  '/event-items',
+  '/ancient-artifacts',
+  '/recipes',
+  '/dish',
+  '/checklist',
+  '/life'
+];
+
+const robotsDisallowPaths = [
+  '/admin',
+  '/login',
+  '/register',
+  '/forgot-password',
+  '/reset-password',
+  '/verify-email',
+  '/pokemon/new',
+  '/event-pokemon/new',
+  '/pokemon/*/edit',
+  '/habitats/new',
+  '/event-habitats/new',
+  '/habitats/*/edit',
+  '/items/new',
+  '/event-items/new',
+  '/items/*/edit',
+  '/ancient-artifacts/new',
+  '/ancient-artifacts/*/edit',
+  '/recipes/new',
+  '/recipes/*/edit',
+  '/automation',
+  '/events',
+  '/actions',
+  '/dream-island',
+  '/clothes'
+];
+
+export function normalizeSiteUrl(value: unknown): string {
+  return (typeof value === 'string' && value.trim() ? value.trim() : fallbackSiteUrl).replace(/\/+$/, '');
+}
+
+export function robotsTxt(siteUrl: string): string {
+  const disallowLines = robotsDisallowPaths.map((path) => `Disallow: ${path}`).join('\n');
+  return `User-agent: *\nAllow: /\n${disallowLines}\nSitemap: ${siteUrl}/sitemap.xml\n`;
+}
+
+export function sitemapXml(siteUrl: string): string {
+  const urls = sitemapPaths
+    .map(
+      (path) => `  <url>
+    <loc>${siteUrl}${path}</loc>
+    <changefreq>weekly</changefreq>
+  </url>`
+    )
+    .join('\n');
+
+  return `<?xml version="1.0" encoding="UTF-8"?>
+<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
+${urls}
+</urlset>
+`;
+}