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/components/landing/SectionLabel.vue

@@ -0,0 +1,28 @@
+<script setup lang="ts">
+// Monospace "NN — label" section header with an underline. Ported from
+// landing-sections.jsx SectionLabel. Pass the full "01 — udfordringen" string.
+import { useTheme } from '~/composables/useLanding'
+
+const props = defineProps<{ label: string }>()
+const t = useTheme()
+
+const parts = computed(() => {
+  const [index, ...rest] = props.label.split(' — ')
+  return { index, text: rest.join(' — ') }
+})
+</script>
+
+<template>
+  <div :style="{
+    display: 'flex', alignItems: 'center', gap: '14px',
+    paddingBottom: '24px', marginBottom: '56px',
+    borderBottom: `1px solid ${t.border}`,
+    fontFamily: '\'JetBrains Mono\', monospace',
+    fontSize: '11px', letterSpacing: '0.16em', textTransform: 'uppercase',
+    color: t.fgMuted,
+  }">
+    <span :style="{ color: t.fgDim }">{{ parts.index }}</span>
+    <span>—</span>
+    <span>{{ parts.text }}</span>
+  </div>
+</template>