feat(i18n): add static pre-rendering for multi-language support

- Add `generate-i18n-pages.mjs` script to pre-render localized HTML files at build time
- Add `generate-sitemap.mjs` script to generate language-aware sitemap.xml
- Create `navbar-simple.html` and `footer-simple.html` partials for simple mode
- Update all 80+ tool pages with language routing support
- Expand supported languages to 12: en, de, es, fr, it, pt, tr, vi, id, zh, zh-TW
- Update i18n.ts with new language names and support configuration
- Implement languageRouterPlugin in vite.config.ts for dev server routing
- Update nginx.conf for production static file serving from language directories
- Update TRANSLATION.md with new architecture documentation and language addition guide
- Fix relative paths in 404.html for static deployment compatibility
- Update package.json with new build scripts and dependencies
- Improves SEO through static pre-rendering and proper sitemap generation

terms.html

@@ -209,7 +209,7 @@
             <li>
               <strong>License Agreement:</strong> You have read and understood
               the
-              <a href="/licensing.html" class="text-indigo-400 hover:underline"
+              <a href="licensing.html" class="text-indigo-400 hover:underline"
                 >Licensing Page</a
               >
               in its entirety before making your purchase.
@@ -253,7 +253,7 @@
           </ul>
           <p>
             For complete licensing details, please visit our
-            <a href="/licensing.html" class="text-indigo-400 hover:underline"
+            <a href="licensing.html" class="text-indigo-400 hover:underline"
               >Licensing Page</a
             >.
           </p>