feat(website): gated coming-soon holding page with email signup

Add a standalone bilingual /coming-soon page (branded, dark, email signup
via mailto:info@dezky.eu, fires a waitlist-signup Umami event, noindex) plus
a global middleware that redirects every route to the locale-correct holding
page while NUXT_PUBLIC_COMING_SOON=true.

- Env-gated (default off, so dev and the live site are unaffected); flip the
  env in Coolify to show/hide the holding page with no code change.
- Preview the real site behind the gate via ?preview=<previewToken>
  (NUXT_PUBLIC_PREVIEW_TOKEN), which sets a 7-day cookie.
- Locale-preserving redirects (/da/* -> /da/coming-soon), no loops.

apps/website/utils/landingCopy.ts

@@ -6,6 +6,14 @@ export type HeadlinePart = string | { hl: string }
 
 export const COPY = {
   da: {
+    waitlist: {
+      eyebrow: 'snart klar',
+      heading: 'Vi er der næsten.',
+      body: 'dezky lægger sidste hånd på den suveræne arbejdsplads — mail, filer, video, chat og login, hostet i EU. Skriv dig op, så siger vi til, så snart vi går live.',
+      emailPh: 'din@e-mail.dk',
+      submit: 'Hold mig opdateret',
+      note: 'Ingen spam — kun én mail, når vi lancerer.',
+    },
     nav: { product: 'produkt', security: 'sikkerhed', whitelabel: 'whitelabel', pricing: 'priser', docs: 'docs', login: 'log ind', cta: 'book en demo' },
     hero: {
       eyebrow: '// suveræn produktivitet · v1.0',
@@ -508,6 +516,14 @@ export const COPY = {
     },
   },
   en: {
+    waitlist: {
+      eyebrow: 'coming soon',
+      heading: 'We\'re almost there.',
+      body: 'dezky is putting the finishing touches on its sovereign workplace — mail, files, video, chat and sign-in, hosted in the EU. Leave your email and we\'ll let you know the moment we go live.',
+      emailPh: 'you@company.com',
+      submit: 'Notify me',
+      note: 'No spam — just one email when we launch.',
+    },
     nav: { product: 'product', security: 'security', whitelabel: 'whitelabel', pricing: 'pricing', docs: 'docs', login: 'log in', cta: 'book a demo' },
     hero: {
       eyebrow: '// sovereign productivity · v1.0',