✨ feat(frontend): Storybook + auto-generated Playwright e2e docs with screenshots (#30)

Storybook 8 + Playwright JSON reporter + auto-generated markdown docs with embedded screenshots and breadcrumbs. Frontend PRs now reviewable from Gitea web UI. ~95% Mistral autonomous via ICM workspace, trainer commit/PR (Mistral hit turn limit).

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

frontend/components/HealthDashboard.stories.ts

@@ -0,0 +1,16 @@
+import type { Meta, StoryObj } from '@storybook/vue3'
+import HealthDashboard from './HealthDashboard.vue'
+
+const meta: Meta<typeof HealthDashboard> = {
+  title: 'Components/HealthDashboard',
+  component: HealthDashboard,
+  tags: ['autodocs'],
+}
+
+export default meta
+
+type Story = StoryObj<typeof meta>
+
+export const Default: Story = {
+  args: {},
+}