feat: initialize frontend with Next.js, Tailwind CSS, and internationalization support

- Added package.json for project dependencies and scripts
- Configured PostCSS with Tailwind CSS
- Created global styles and theme context for dark mode support
- Implemented layout and routing for internationalization using next-intl
- Developed main components: Header, Footer, Hero, About, Skills, Projects, Contact
- Added language switcher and contact form with validation
- Created project card component to display project details
- Set up localization files for English and Portuguese
- Configured Tailwind CSS for styling and responsive design
- Added favicon and logo assets

frontend/tailwind.config.ts

@@ -0,0 +1,14 @@
+import type { Config } from "tailwindcss";
+
+const config: Config = {
+  // O modo dark é automático na v4, mas pode manter para clareza
+  darkMode: "class", 
+  content: [
+    "./src/pages/**/*.{js,ts,jsx,tsx,mdx}",
+    "./src/components/**/*.{js,ts,jsx,tsx,mdx}",
+    "./src/app/**/*.{js,ts,jsx,tsx,mdx}",
+  ],
+  // REMOVA A CHAVE 'theme' INTEIRA.
+  // plugins: [], // Plugins, se você tiver, continuam aqui.
+};
+export default config;