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/changelog.vue

@@ -0,0 +1,38 @@
+<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.changelog)
+
+useHead({ title: () => `${copy.value.pages.changelog.label} · dezky` })
+</script>
+
+<template>
+  <LandingPageHeader :label="c.label" :title="c.title" :intro="c.intro" />
+
+  <LandingContainer pad="56px 64px 160px">
+    <div :style="{ maxWidth: '760px' }">
+      <div
+        v-for="(entry, i) in c.entries" :key="i"
+        :style="{ display: 'grid', gridTemplateColumns: '160px 1fr', gap: '32px', padding: '32px 0', borderTop: `1px solid ${t.border}`, alignItems: 'start' }"
+      >
+        <div>
+          <div :style="{ fontFamily: '\'Inter Tight\', sans-serif', fontWeight: 600, fontSize: '20px', color: t.fg, letterSpacing: '-0.015em' }">{{ entry[0] }}</div>
+          <div :style="{ marginTop: '4px', fontFamily: '\'JetBrains Mono\', monospace', fontSize: '12px', color: t.fgDim }">{{ entry[1] }}</div>
+        </div>
+        <ul :style="{ margin: 0, padding: 0, listStyle: 'none', display: 'flex', flexDirection: 'column', gap: '12px' }">
+          <li
+            v-for="(item, j) in entry[2]" :key="j"
+            :style="{ display: 'flex', gap: '12px', fontFamily: '\'Inter\', sans-serif', fontSize: '15px', lineHeight: 1.5, color: t.fg }"
+          >
+            <span :style="{ color: t.fgDim, flexShrink: 0 }">—</span>
+            <span>{{ item }}</span>
+          </li>
+        </ul>
+      </div>
+    </div>
+  </LandingContainer>
+</template>