feat: scaffold Nuxt 3 + Nuxt UI 3

Initialize Nuxt 4 project with @nuxt/ui template including Tailwind CSS v4,
TypeScript, ESLint, and Nuxt UI v3 (via @nuxt/ui package).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

front-end/tsconfig.json

@@ -0,0 +1,10 @@
+{
+  // https://nuxt.com/docs/guide/concepts/typescript
+  "files": [],
+  "references": [
+    { "path": "./.nuxt/tsconfig.app.json" },
+    { "path": "./.nuxt/tsconfig.server.json" },
+    { "path": "./.nuxt/tsconfig.shared.json" },
+    { "path": "./.nuxt/tsconfig.node.json" }
+  ]
+}