feat: initial portfolio implementation with dark mode and i18n

- Add Astro portfolio with TypeScript
- Implement dark/light theme toggle
- Add Spanish/English translations
- Create under construction page
- Style with Tailwind CSS and glassmorphism effects
- Add profile image, projects, skills, and experience sections

public/scripts/theme-toggle.js

@@ -0,0 +1,15 @@
+(function() {
+  const theme = localStorage.getItem('theme');
+  const systemPrefersDark = window.matchMedia('(prefers-color-scheme: dark)').matches;
+  const initialTheme = theme || (systemPrefersDark ? 'dark' : 'light');
+  
+  document.documentElement.classList.toggle('dark', initialTheme === 'dark');
+  
+  window.toggleTheme = function() {
+    const currentTheme = document.documentElement.classList.contains('dark') ? 'dark' : 'light';
+    const newTheme = currentTheme === 'dark' ? 'light' : 'dark';
+    
+    document.documentElement.classList.toggle('dark');
+    localStorage.setItem('theme', newTheme);
+  };
+})();