feat: Vue 3 Basis mit TailwindCSS, PrimeVUE, i18n und Dark/Light Mode

- Vue 3 + Vite Setup
- TailwindCSS für Styling
- PrimeVUE Komponenten
- vue-i18n (DE/EN)
- Dark/Light Mode Toggle
- Responsive Landingpage
- Docker-ready

src/assets/main.css

@@ -0,0 +1,19 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+:root {
+  --color-bg: #ffffff;
+  --color-text: #1a1a1a;
+}
+
+.dark {
+  --color-bg: #1a1a1a;
+  --color-text: #ffffff;
+}
+
+body {
+  background-color: var(--color-bg);
+  color: var(--color-text);
+  transition: background-color 0.3s, color 0.3s;
+}