🎨 Frontend komplett implementiert

Views:
- Login/Registrierung
- Dashboard mit Stats
- Aufträge (Liste + Detail)
- Mitarbeiterverwaltung
- Verfügbarkeitskalender
- Stundenzettel
- Einstellungen
- Module (Dev-Panel)

Features:
- Vue 3 + Composition API
- TailwindCSS mit Dark Mode
- Pinia State Management
- JWT Auth mit Refresh
- Responsive Design
- Rollen-basierte Navigation

src/assets/main.css

@@ -0,0 +1,59 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+@layer base {
+  body {
+    @apply text-gray-900 dark:text-gray-100;
+  }
+}
+
+@layer components {
+  .btn {
+    @apply px-4 py-2 rounded-lg font-medium transition-colors duration-200;
+  }
+  
+  .btn-primary {
+    @apply bg-primary-600 text-white hover:bg-primary-700 focus:ring-2 focus:ring-primary-500 focus:ring-offset-2;
+  }
+  
+  .btn-secondary {
+    @apply bg-gray-200 text-gray-800 hover:bg-gray-300 dark:bg-gray-700 dark:text-gray-200 dark:hover:bg-gray-600;
+  }
+  
+  .btn-danger {
+    @apply bg-red-600 text-white hover:bg-red-700;
+  }
+  
+  .btn-success {
+    @apply bg-green-600 text-white hover:bg-green-700;
+  }
+  
+  .input {
+    @apply w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-primary-500 focus:border-primary-500 dark:bg-gray-800 dark:border-gray-600 dark:text-white;
+  }
+  
+  .card {
+    @apply bg-white dark:bg-gray-800 rounded-xl shadow-sm border border-gray-200 dark:border-gray-700 p-6;
+  }
+  
+  .badge {
+    @apply inline-flex items-center px-2.5 py-0.5 rounded-full text-xs font-medium;
+  }
+  
+  .badge-primary {
+    @apply bg-primary-100 text-primary-800 dark:bg-primary-900 dark:text-primary-200;
+  }
+  
+  .badge-success {
+    @apply bg-green-100 text-green-800 dark:bg-green-900 dark:text-green-200;
+  }
+  
+  .badge-warning {
+    @apply bg-yellow-100 text-yellow-800 dark:bg-yellow-900 dark:text-yellow-200;
+  }
+  
+  .badge-danger {
+    @apply bg-red-100 text-red-800 dark:bg-red-900 dark:text-red-200;
+  }
+}