feat(website): book-a-demo & status pages, expand roadmap/contact

- /demo: book-a-demo page with a what-to-expect column + a form that
  composes a prefilled email to info@dezky.eu (interim, no backend); built
  to swap for a self-hosted scheduler later. Wire every "Book a demo" CTA
  (nav, hero, pricing, the previously-dead final-CTA button, and the
  contact/partners/migration/coming-soon CTAs) to /demo.
- /status: manually-maintained system-status page (overall banner,
  per-service rows, incident history). Live modules operational; Video/Chat
  marked coming soon.
- Roadmap: expand the board (5 items/column) + a "the bigger picture"
  themes grid + a "suggest a feature" CTA + a directional-timelines note.
- Contact: purpose-specific channels (info@ / legal@ / privacy@), a
  response-time note, and a company + "see it live" demo block.
- Drop /status from the [slug].vue stub map; tidy now-unused imports.

apps/website/components/landing/ComingSoon.vue

@@ -2,18 +2,16 @@
 // Placeholder body for not-yet-built sub-pages. Shows the page title under a
 // "coming soon" eyebrow, an explanatory line, and a demo CTA. Legal pages pass
 // the legal-specific body instead of the generic one.
-import { useRoute } from 'vue-router'
-import { useCopy, goToSection } from '~/composables/useLanding'
+import { useCopy } from '~/composables/useLanding'
 
 defineProps<{ title: string, body: string }>()
 
 const copy = useCopy()
-const route = useRoute()
 </script>
 
 <template>
   <LandingPageHeader :label="copy.pages.comingSoonKicker" :title="title" :intro="body" />
   <LandingContainer pad="clamp(32px, 5vw, 48px) clamp(20px, 5vw, 64px) clamp(56px, 8vw, 160px)">
-    <LandingBtn variant="primary" size="lg" @click="goToSection('#final-cta', route.path)">{{ copy.pages.ctaDemo }} →</LandingBtn>
+    <LandingBtn variant="primary" size="lg" @click="navigateTo('/demo')">{{ copy.pages.ctaDemo }} →</LandingBtn>
   </LandingContainer>
 </template>