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/renovate.json

@@ -0,0 +1,13 @@
+{
+  "extends": [
+    "github>nuxt/renovate-config-nuxt"
+  ],
+  "lockFileMaintenance": {
+    "enabled": true
+  },
+  "packageRules": [{
+    "matchDepTypes": ["resolutions"],
+    "enabled": false
+  }],
+  "postUpdateOptions": ["pnpmDedupe"]
+}