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/language-toggle.js

@@ -0,0 +1,20 @@
+(function () {
+  const savedLang = localStorage.getItem("language") || "en";
+  const htmlLang = document.documentElement.lang || "en";
+  const currentLang = savedLang || htmlLang;
+
+  window.setLanguage = function (lang) {
+    localStorage.setItem("language", lang);
+    location.reload();
+  };
+
+  window.getCurrentLanguage = function () {
+    return localStorage.getItem("language") || "en";
+  };
+
+  window.toggleLanguage = function () {
+    const currentLang = getCurrentLanguage();
+    const newLang = currentLang === "en" ? "es" : "en";
+    setLanguage(newLang);
+  };
+})();