feat(site): rewrite the landing page around verified facts and accessible controls

- Replace claims that contradicted the app: the default hotkey is Right Alt
  (hold to talk), local features are free with no daily cap, there is no
  14-day trial, Team/SSO/SCIM/ZDR are not offered, and the repository is not
  public. Remove invented metrics, status badges, the competitor table, the
  ad-mediation changelog, the hash calculator and the duplicate demo.
- Seven sections: hero with one labelled example, features, how it works,
  privacy, pricing (Free / Pro 2,900 / Pro+ 8,900 KRW a month), download, FAQ.
  Footer links the privacy policy, terms and account deletion pages.
- All copy moves into i18n and every one of the 10 locales is translated.
  Pricing and cloud quotas come from site/src/pricing.ts.
- Accessibility: skip link, labelled sections, aria-expanded with Esc and
  focus return for the menu, language list and FAQ, live status for the
  example, reduced-motion support, 44px targets, AA contrast on the primary
  button. Korean keep-all line breaking is scoped to :lang(ko) because
  Tailwind's break-keep blocked wrapping in Japanese and Chinese.
- JS 111 -> 98 KB gzip, CSS 7.8 -> 5.2 KB gzip.

site/src/App.tsx

@@ -1,4 +1,4 @@
-import { I18nProvider } from './i18n'
+import { I18nProvider, useI18n } from './i18n'
 import { Header } from './sections/Header'
 import { Hero } from './sections/Hero'
 import { Features } from './sections/Features'
@@ -7,26 +7,32 @@ import { Privacy } from './sections/Privacy'
 import { Pricing } from './sections/Pricing'
 import { Download } from './sections/Download'
 import { FAQ } from './sections/FAQ'
-import { CTA } from './sections/CTA'
 import { Footer } from './sections/Footer'
 
+function Page() {
+  const { t } = useI18n()
+  return (
+    <div id="top">
+      <a href="#main" className="skip-link">{t.a11y.skipToContent}</a>
+      <Header />
+      <main id="main" tabIndex={-1} className="outline-none">
+        <Hero />
+        <Features />
+        <HowItWorks />
+        <Privacy />
+        <Pricing />
+        <Download />
+        <FAQ />
+      </main>
+      <Footer />
+    </div>
+  )
+}
+
 export function App() {
   return (
     <I18nProvider>
-      <div className="min-h-screen bg-surface-950">
-        <Header />
-        <main>
-          <Hero />
-          <Features />
-          <HowItWorks />
-          <Privacy />
-          <Pricing />
-          <Download />
-          <FAQ />
-          <CTA />
-        </main>
-        <Footer />
-      </div>
+      <Page />
     </I18nProvider>
   )
 }