refactor(data): update skills and about info sections

- Remove duplicate mobile frameworks (uniApp, WeChat Mini Program)
- Add React Native and Flutter to mobile skills
- Update languages and frameworks in about section
- Add backend, database and devops details to about section

src/pages/index.astro

@@ -142,9 +142,12 @@ const pageTitle = t('site.title');
                   Host: ThinkPad X1 Carbon<br/>
                   Kernel: 5.15.0-dev<br/>
                   Uptime: 45 days, 17 hours<br/>
-                  Languages: JavaScript, Python, Go<br/>
+                  Languages: TypeScript, JavaScript, Python<br/>
                   Editor: VSCode / Neovim<br/>
-                  Frameworks: React, Next.js, Node.js
+                  Frontend: React, Vue, Next.js, Nuxt.js<br/>
+                  Backend: Node.js, Express.js, Nest.js<br/>
+                  Database: PostgreSQL, MongoDB<br/>
+                  DevOps: Docker, Git, AWS, Cloudflare
                 </div>
                 
                 <div class="flex items-center mt-4">