feat: initialize Vue 3 project with Tailwind CSS and Vite

- Add package.json with project metadata and dependencies
- Create favicon.ico and ritsu.png assets
- Implement main App.vue component with site structure
- Add HeroSection, RitsuSection, SiteHeader, and SupportSection components
- Set up theme toggle functionality in SiteHeader
- Create main entry point in main.ts
- Add Tailwind CSS styles in style.css
- Configure TypeScript with tsconfig files
- Set up Vite configuration for Vue and Tailwind CSS

src/style.css

@@ -0,0 +1,7 @@
+@import "tailwindcss";
+
+@media (prefers-color-scheme: dark) {
+  body { background: black; color: white; }
+}
+
+@custom-variant dark (&:where(.dark, .dark *));