feat(website): bilingual i18n (English default, Danish at /da) + SEO

Add @nuxtjs/i18n: English is the default locale (no prefix), Danish lives
under /da (prefix_except_default). Both server-rendered and indexed with
hreflang alternates + per-locale canonical (useLocaleHead in app.vue).
First-visit browser language is auto-detected and remembered in the
i18n_redirected cookie (redirectOn root).

- Keep the hand-authored COPY object; useLang/useCopy now read the i18n
  locale; useLocalizeHref/useLangToggle added. Every internal link is
  localized so navigation stays in-locale.
- Clear segmented EN|DA language switcher (active segment filled) replacing
  the ambiguous "en · da" pill.
- SEO: useSeoMeta defaults are locale-aware; og:image switches per locale
  (English / Danish share card); favicon links; robots.txt + sitemap.xml;
  env-aware siteUrl/baseUrl (localhost in dev, dezky.eu in prod).
- Update the cookie policy (dezky-lang -> i18n_redirected).
- Gate the Traefik wss:443 HMR behind DEZKY_TRAEFIK so localhost dev/DevTools
  connect over plain ws (fixes the DevTools disconnect loop).

apps/website/components/landing/Footer.vue

@@ -5,16 +5,18 @@
 // home + scroll from a sub-page.
 import { useRoute } from 'vue-router'
 import { C } from '~/utils/landingTokens'
-import { useTheme, useCopy, scrollToAnchor } from '~/composables/useLanding'
+import { useTheme, useCopy, useLocalizeHref, scrollToAnchor } from '~/composables/useLanding'
 const t = useTheme()
 const copy = useCopy()
 const route = useRoute()
+const loc = useLocalizeHref()
+const localePath = useLocalePath()
 
 function onLink(e: MouseEvent, href: string) {
   // In-page section link ("/#suite"): smooth-scroll in place when already on
-  // the homepage. Off-page, let NuxtLink route to "/#suite" — index.vue scrolls
-  // to the hash on mount.
-  if (href.includes('#') && route.path === '/') {
+  // the current locale's homepage. Off-page, let NuxtLink route to the
+  // localized home + hash — index.vue scrolls to the hash on mount.
+  if (href.includes('#') && route.path === localePath('/')) {
     e.preventDefault()
     scrollToAnchor(href.slice(href.indexOf('#')))
   }
@@ -41,7 +43,7 @@ function onLink(e: MouseEvent, href: string) {
             <div :style="{ fontFamily: '\'JetBrains Mono\', monospace', fontSize: '11px', color: 'rgba(10,10,10,0.45)', letterSpacing: '0.1em', textTransform: 'uppercase', marginBottom: '18px' }">{{ col[0] }}</div>
             <div :style="{ display: 'flex', flexDirection: 'column', gap: '12px' }">
               <NuxtLink
-                v-for="(link, j) in col[1]" :key="j" :to="link[1]"
+                v-for="(link, j) in col[1]" :key="j" :to="loc(link[1])"
                 :style="{ fontFamily: '\'Inter\', sans-serif', fontSize: '14px', color: 'rgba(10,10,10,0.78)' }"
                 @click="onLink($event, link[1])"
               >{{ link[0] }}</NuxtLink>