WP-12: contract and failing tests for the Kubernetes overview

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

frontend/e2e/cluster.spec.ts

@@ -0,0 +1,21 @@
+import { test, expect } from '@playwright/test'
+
+test('cluster page shows node, workloads and lets an admin restart a workload', async ({
+  page,
+}) => {
+  await page.goto('/login')
+  await page.getByLabel('Email').fill('admin@example.com')
+  await page.getByLabel('Password').fill('admin-password-123')
+  await page.getByRole('button', { name: 'Sign in' }).click()
+  await page.getByRole('link', { name: 'Kubernetes' }).click()
+
+  await expect(page.getByTestId('node-version')).toContainText('v1.32')
+  const row = page.getByRole('row', { name: /gitea-postgresql/ })
+  await expect(row).toContainText('statefulset')
+  page.once('dialog', (d) => d.accept())
+  await page
+    .getByRole('row', { name: /^gitea deployment/ })
+    .getByRole('button', { name: 'Restart' })
+    .click()
+  await expect(page.getByRole('status')).toContainText('Restart requested')
+})