✨ 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/tests/e2e/health.spec.ts

@@ -0,0 +1,8 @@
+import { test, expect } from '@playwright/test'
+
+test('home page loads and shows server health info', async ({ page }) => {
+  await page.goto('/')
+  await expect(page.getByTestId('health-dashboard')).toBeVisible()
+  const heading = page.getByRole('heading', { name: /dance-lessons-coach/i })
+  await expect(heading).toBeVisible()
+})