feat(config, layout, components): enhance security headers, improve SEO, and update project descriptions

- Added security headers in the Next.js configuration to enhance application security.
- Updated metadata in the layout component for improved SEO, including new titles, descriptions, and keywords.
- Introduced JSON-LD schema for projects to enhance search engine visibility.
- Enhanced project descriptions in the portfolio data for clarity and detail.
- Improved header component with logo integration and refined social media links for better accessibility.

app/components/About.tsx

@@ -138,6 +138,16 @@ export default function About() {
             </div>
           ))}
         </div>
+
+        {/* SEO Semantic Content - Visible but subtle */}
+        <div className="mt-16 pt-8 border-t border-slate-800">
+          <p className="text-xs text-slate-600 text-center max-w-2xl mx-auto leading-relaxed">
+            Evandro Fonseca Junior é Engenheiro Full-Stack especializado em Next.js, 
+            React, Angular e Node.js. Desenvolvedor de aplicações desktop com Tauri, 
+            sistemas web escaláveis e automação de processos. Experiência em PostgreSQL, 
+            MySQL, computação em nuvem e IoT. Localizado em Garuva, Santa Catarina, Brasil.
+          </p>
+        </div>
       </div>
     </section>
   );