[grade=pending] fix: update language count from 5 to 31 across marketing site

- Homepage hero: 5 → 31 languages incl. Arabic (RTL)
- Homepage integrations section: 5 → 31 languages, RTL
- Features page: 5 → 31 languages in description and feature list
- Docs/premium: Internationalization (5 → 31 languages)
- Pricing: i18n — 5 → 31 languages

The DC-077 i18n system expanded from 5 to 31 languages.

src/app/docs/premium/page.tsx

@@ -54,7 +54,7 @@ export default function DocsPremiumPage() {
             <tr><td>AI Intent Router &amp; MCP Server</td><td>✓</td><td>✓</td></tr>
             <tr><td>REST API &amp; MCP Server</td><td>✓</td><td>✓</td></tr>
             <tr><td>Backup / restore &amp; Disaster Recovery</td><td>✓</td><td>✓</td></tr>
-            <tr><td>Internationalization (5 languages)</td><td>✓</td><td>✓</td></tr>
+            <tr><td>Internationalization (31 languages)</td><td>✓</td><td>✓</td></tr>
             <tr><td>Plugin &amp; extension system</td><td>✓</td><td>✓</td></tr>
             <tr><td>Smart Defaults Wizard</td><td>✓</td><td>✓</td></tr>
             <tr><td><strong>Auto-Login SSO</strong></td><td>—</td><td>✓</td></tr>