✨ feat(frontend): scaffold minimal Nuxt 3 frontend with healthz dashboard (#25)

First Vue 3 / Nuxt 3 / Playwright frontend layer for dance-lessons-coach. Minimal: 1 page, 1 component fetching /api/healthz, 1 e2e test. Out of scope: Storybook, design system, auth pages, deploy.

~95% Mistral autonomous via ICM workspace ~/Work/Vibe/workspaces/frontend-nuxt-scaffold/. Mistral handled the npx nuxi init TUI by falling back to manual file creation (Q-032 documented).

Co-authored-by: Gabriel Radureau <arcodange@gmail.com>
Co-committed-by: Gabriel Radureau <arcodange@gmail.com>

frontend/components/HealthDashboard.vue

@@ -0,0 +1,22 @@
+<script setup lang="ts">
+interface HealthInfo {
+  status: string
+  version: string
+  uptime_seconds: number
+  timestamp: string
+}
+const { data, pending, error } = await useFetch<HealthInfo>('/api/healthz')
+</script>
+<template>
+  <section data-testid="health-dashboard">
+    <h2>Server Health</h2>
+    <p v-if="pending">Loading...</p>
+    <p v-else-if="error">Error loading health: {{ error.message }}</p>
+    <ul v-else-if="data" data-testid="health-info">
+      <li><strong>Status:</strong> <span data-testid="health-status">{{ data.status }}</span></li>
+      <li><strong>Version:</strong> {{ data.version }}</li>
+      <li><strong>Uptime:</strong> {{ data.uptime_seconds }} seconds</li>
+      <li><strong>Last check:</strong> {{ data.timestamp }}</li>
+    </ul>
+  </section>
+</template>