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/tailwind.config.js

@@ -9,6 +9,8 @@ export default {
           blue: '#3b82f6',
           'blue-light': '#60a5fa',
           'blue-dark': '#2563eb',
+          // 버튼 hover. 흰 글자 대비 6.7:1 (blue-dark 5.2:1, blue 3.7:1 은 본문 버튼에 부족)
+          'blue-deep': '#1d4ed8',
           'blue-glow': 'rgba(59,130,246,0.5)',
           'blue-dim': 'rgba(59,130,246,0.14)',
           'blue-muted': 'rgba(59,130,246,0.08)',
@@ -101,36 +103,16 @@ export default {
         '3card': '24px',
       },
       boxShadow: {
-        'inset-panel': 'inset 0 1px 3px rgba(0,0,0,0.6), inset 0 1px 0 rgba(255,255,255,0.06)',
         'chassis': '0 4px 20px rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.06)',
-        'glow-sm': '0 0 12px rgba(59,130,246,0.3)',
-        'glow-md': '0 0 24px rgba(59,130,246,0.25), 0 0 48px rgba(59,130,246,0.1)',
-        'glow-lg': '0 0 36px rgba(59,130,246,0.35), 0 0 72px rgba(59,130,246,0.15)',
-        'glass-card': '0 12px 32px -4px rgba(0,0,0,0.5), inset 0 1px 0 rgba(255,255,255,0.08)',
       },
       animation: {
         'glow-pulse': 'glow-pulse 2s ease-in-out infinite',
-        'scan': 'scan 8s linear infinite',
-        'blink': 'blink 1.4s ease-in-out infinite',
-        'fade-in-up': 'fade-in-up 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards',
       },
       keyframes: {
         'glow-pulse': {
           '0%, 100%': { opacity: '0.4' },
           '50%': { opacity: '1' },
         },
-        'scan': {
-          '0%': { transform: 'translateY(-100%)' },
-          '100%': { transform: 'translateY(100%)' },
-        },
-        'blink': {
-          '0%, 100%': { opacity: '1' },
-          '50%': { opacity: '0.3' },
-        },
-        'fade-in-up': {
-          '0%': { opacity: '0', transform: 'translateY(16px)' },
-          '100%': { opacity: '1', transform: 'translateY(0)' },
-        },
       },
     },
   },