Update sitemaps and improve language handling

- Updated last modification dates in static and tools sitemaps to 2026-04-01.
- Enhanced language switching in the Header component to ensure language resources are loaded before changing the language.
- Added language resource loading logic in i18n configuration to support dynamic loading of language files.
- Improved SEO route page to ensure correct language is set based on URL parameters.
- Adjusted global CSS for deferred sections to optimize rendering.
- Configured Nginx to enable Brotli compression for better performance.

frontend/public/sitemaps/static.xml

@@ -2,55 +2,55 @@
 <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
   <url>
     <loc>https://dociva.io/</loc>
-    <lastmod>2026-03-30</lastmod>
+    <lastmod>2026-04-01</lastmod>
     <changefreq>daily</changefreq>
     <priority>1.0</priority>
   </url>
   <url>
     <loc>https://dociva.io/tools</loc>
-    <lastmod>2026-03-30</lastmod>
+    <lastmod>2026-04-01</lastmod>
     <changefreq>weekly</changefreq>
     <priority>0.8</priority>
   </url>
   <url>
     <loc>https://dociva.io/about</loc>
-    <lastmod>2026-03-30</lastmod>
+    <lastmod>2026-04-01</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.4</priority>
   </url>
   <url>
     <loc>https://dociva.io/contact</loc>
-    <lastmod>2026-03-30</lastmod>
+    <lastmod>2026-04-01</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.4</priority>
   </url>
   <url>
     <loc>https://dociva.io/privacy</loc>
-    <lastmod>2026-03-30</lastmod>
+    <lastmod>2026-04-01</lastmod>
     <changefreq>yearly</changefreq>
     <priority>0.3</priority>
   </url>
   <url>
     <loc>https://dociva.io/terms</loc>
-    <lastmod>2026-03-30</lastmod>
+    <lastmod>2026-04-01</lastmod>
     <changefreq>yearly</changefreq>
     <priority>0.3</priority>
   </url>
   <url>
     <loc>https://dociva.io/pricing</loc>
-    <lastmod>2026-03-30</lastmod>
+    <lastmod>2026-04-01</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.7</priority>
   </url>
   <url>
     <loc>https://dociva.io/blog</loc>
-    <lastmod>2026-03-30</lastmod>
+    <lastmod>2026-04-01</lastmod>
     <changefreq>weekly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://dociva.io/developers</loc>
-    <lastmod>2026-03-30</lastmod>
+    <lastmod>2026-04-01</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.5</priority>
   </url>