feat(e2e): add Playwright e2e tests for first-run wizard and settings page

[Copilot]

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fix(e2e): use nextcloud-version-matrix to determine correct server branch

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refactor: use @nextcloud/e2e-test-server for Docker-based e2e testing

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fix(e2e): fix 3 failing test cases

• Fix App.vue to skip intro animation in changelog-only mode
• Fix 'can be navigated' test: NcButton primary variant has no CSS class
• Fix settings test: duplicate ID selector + add Skip button click
• Use --with-deps for Playwright install in CI

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fix(e2e): revert App.vue changes, fix tests without app-level workarounds

• Revert src/views/App.vue to original state (always start at intro animation)
• Fix 'opens when a new major version' test: click Skip to advance past intro
• Move 'About & What's new' wizard test from settings.spec.ts to firstrunwizard.spec.ts
• Remove 'About & What's new' describe block from settings.spec.ts

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fix(e2e): fix setUserPreference to pass value as positional arg to occ user:setting

occ user:setting takes the value as a positional argument, not --value=VALUE.
The --value flag was silently ignored, so setUserPreference never actually set
the 'show' preference, causing the 'opens when a new major version was shipped'
test to always fail with the wizard landing on page 0 instead of the whats-new page.

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fix(e2e): refactor tests to use Playwright fixtures and fix infrastructure issues

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fix(e2e): use HTTP-only server, fixture-based random user login, fix copyright year

• Remove generateSslCertificate(); add makeHttpOnly() that patches the
  container's run.sh to strip the SSL directives (a2enmod ssl, a2ensite
  default-ssl, a2enconf ssl-params, apache2ctl configtest) so Apache
  starts on plain HTTP. Import getContainerName from the package instead
  of recomputing it with basename(process.cwd()).
• Rewrite fixtures.ts following susnux's suggestion: extend the test
  base with a user fixture (auto: true) that creates a random user,
  logs in via the Nextcloud login form, and deletes the user after the
  test. auto:true ensures every test gets a fresh authenticated session
  without having to explicitly request the fixture.
• Remove all try/finally blocks and manual user management from the spec
  files; tests that need user.userId declare { page, user }, others only
  { page }.
• Fix copyright year 2024 → 2026 in all new/modified e2e files.
• Remove unused basename import from start-nextcloud-server.mjs.

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