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/eslint.config.mjs

@@ -0,0 +1,6 @@
+// @ts-check
+import withNuxt from './.nuxt/eslint.config.mjs'
+
+export default withNuxt(
+  // Your custom configs here
+)