feat(website): footer sub-pages + shared page layout

Wire every footer link to a real route. Adds a shared `page` layout (Nav +
content + Footer), reusable PageHeader/ComingSoon components, six content pages
(about, contact, brand, roadmap, changelog, migration), and a dynamic [slug]
catch-all for the not-yet-built pages — unknown slugs 404, legal slugs get a
distinct "contact us" body.

Footer links repointed from dead "#" to real paths; section anchors ("/#suite")
smooth-scroll on the homepage and route home + scroll from a sub-page; logo
links home. Page copy (da + en) added under COPY.pages.

apps/website/pages/roadmap.vue

@@ -0,0 +1,35 @@
+<script setup lang="ts">
+import { useTheme, useCopy } from '~/composables/useLanding'
+
+definePageMeta({ layout: 'page' })
+
+const t = useTheme()
+const copy = useCopy()
+const c = computed(() => copy.value.pages.roadmap)
+
+useHead({ title: () => `${copy.value.pages.roadmap.label} · dezky` })
+</script>
+
+<template>
+  <LandingPageHeader :label="c.label" :title="c.title" :intro="c.intro" />
+
+  <LandingContainer pad="56px 64px 160px">
+    <div :style="{ display: 'grid', gridTemplateColumns: 'repeat(3, 1fr)', gap: '0', border: `1px solid ${t.border}`, borderRadius: '4px', overflow: 'hidden' }">
+      <div
+        v-for="(col, i) in c.columns" :key="i"
+        :style="{ padding: '32px 28px', borderLeft: i === 0 ? 'none' : `1px solid ${t.border}`, background: t.surface, minHeight: '260px' }"
+      >
+        <div :style="{ display: 'flex', alignItems: 'center', gap: '10px', marginBottom: '24px' }">
+          <span :style="{ width: '6px', height: '6px', borderRadius: '999px', background: i === 0 ? t.signal : t.fgDim }" />
+          <span :style="{ fontFamily: '\'JetBrains Mono\', monospace', fontSize: '11px', color: t.fgMuted, letterSpacing: '0.08em', textTransform: 'uppercase' }">{{ col[0] }}</span>
+        </div>
+        <div :style="{ display: 'flex', flexDirection: 'column', gap: '14px' }">
+          <div
+            v-for="(item, j) in col[1]" :key="j"
+            :style="{ fontFamily: '\'Inter\', sans-serif', fontSize: '15px', lineHeight: 1.5, color: t.fg }"
+          >{{ item }}</div>
+        </div>
+      </div>
+    </div>
+  </LandingContainer>
+</template>