feat: setup Tailwind CSS and initial routing structure

Configure @tailwindcss/vite in Nuxt config
Add default layout and main CSS file
Create initial index and login pages
Replace default Nuxt welcome screen with page routing

pnpm-lock.yaml

@@ -20,6 +20,13 @@ importers:
       vue-router:
         specifier: ^5.0.4
         version: 5.0.4(@vue/compiler-sfc@3.5.32)(vue@3.5.32(typescript@6.0.2))
+    devDependencies:
+      '@tailwindcss/vite':
+        specifier: ^4.2.2
+        version: 4.2.2(vite@7.3.2(jiti@2.6.1)(lightningcss@1.32.0)(terser@5.46.1)(yaml@2.8.3))
+      tailwindcss:
+        specifier: ^4.2.2
+        version: 4.2.2
 
 packages: