feat(website): add Nuxt 4 marketing landing page

New standalone apps/website (Nuxt 4) serving the public marketing site at
dezky.local / www.dezky.local. The customer portal moves off the root domain
to app.dezky.local only.

Landing page ported from the Dezky design handoff: light theme, Danish
default, hero variant A, with a working da/en toggle. Self-contained colour
system threaded through components (utils/landingTokens.ts), full bilingual
copy (utils/landingCopy.ts), and shared state (composables/useLanding.ts).
Sections live under components/landing/* with the Node logo under
components/brand/*.

Wired into docker-compose (website service, volume, Traefik labels, network
aliases) and bootstrap.sh (hosts list + service URLs).

apps/website/composables/useLanding.ts

@@ -0,0 +1,36 @@
+import { computed } from 'vue'
+import { COPY, type Lang } from '~/utils/landingCopy'
+import { makeTheme } from '~/utils/landingTokens'
+
+// Shared landing state. `lang` is a real production toggle (da/en, both fully
+// translated). `dark` is kept as machinery from the design's Tweaks panel but
+// defaults to light — the primary theme the user landed on — and no toggle is
+// surfaced. Flip the default (or add a control) to enable dark later.
+export const useLang = () => useState<Lang>('dz-lang', () => 'da')
+export const useDark = () => useState<boolean>('dz-dark', () => false)
+
+export const useTheme = () => {
+  const dark = useDark()
+  return computed(() => makeTheme(dark.value))
+}
+
+export const useCopy = () => {
+  const lang = useLang()
+  return computed(() => COPY[lang.value === 'en' ? 'en' : 'da'])
+}
+
+export function toggleLang() {
+  const lang = useLang()
+  lang.value = lang.value === 'da' ? 'en' : 'da'
+}
+
+// Smooth-scroll to an in-page anchor, accounting for the sticky 72px nav.
+// Non-anchor / placeholder links (#) are ignored.
+export function scrollToAnchor(hash: string) {
+  if (!hash || hash === '#' || !hash.startsWith('#')) return
+  const el = document.getElementById(hash.slice(1))
+  if (!el) return
+  const top = el.getBoundingClientRect().top + window.scrollY - 72
+  window.scrollTo({ top, behavior: 'smooth' })
+  history.replaceState(null, '', hash)
+}