Add custom fields + warranty plugin, rework settings into two-pane shell

Feature work from the 2026-07 session:

Settings IA
- Replace the flat 27-card settings hub with a persistent two-pane shell
  (SettingsLayout.vue): grouped, searchable left rail + content pane.
- Nest all settings/* routes under the shell via router post-processing;
  shared nav catalog in settingsNav.js. Group by asset class (PCs, Printers,
  Equipment, Network) so per-type settings stop scattering.

Custom fields (core)
- customfields + customfieldvalues tables (migration 7d14), CRUD API at
  /api/customfields, per-asset value get/save.
- Settings management page + reusable CustomFieldsSection (detail) and
  CustomFieldsInputs (form) wired into all four asset types.

Warranty (new plugin)
- plugins/warranty: warranties + warrantyassets (migration 7d15), derived
  coverage status, provider abstraction (manual now; Dell/Lenovo/HP stubs).
- API CRUD + per-asset panel + report buckets; WarrantyPanel on all four
  detail pages; Warranties management page; Warranty report + Reports card.
- Seed warranty.* permissions.

Printer drivers
- printerdrivers table (migration 7d13) linked to printer models; drivers now
  surface on the matching printer's detail page.

Other
- PCDetail rebalanced (Network + Status + Warranty + custom fields on the right).
- Rename PCs list "Features" column to "Remote Access"; fix badge hover underline.
- Drop equipment islocationonly field.
- Centralize asset-type label/route maps into utils/assetTypes.js.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/src/utils/siteSettings.js

@@ -0,0 +1,37 @@
+// Shared read-through for public site settings (site_base_url, facility_name).
+// The settings GET is public (jwt optional), so the kiosk dashboard and the
+// print views can read these without auth. Fetched once and cached per page.
+import { settingsApi } from '@/api'
+
+let settingsCache = null
+
+async function loadSettings() {
+  if (settingsCache) return settingsCache
+  try {
+    const response = await settingsApi.list()
+    const items = response.data?.data || response.data || []
+    settingsCache = {}
+    for (const s of items) settingsCache[s.key] = s.value
+  } catch (err) {
+    console.error('Error loading site settings:', err)
+    settingsCache = {}
+  }
+  return settingsCache
+}
+
+export async function getSetting(key, fallback = '') {
+  const settings = await loadSettings()
+  const value = settings[key]
+  return (value === undefined || value === null || value === '') ? fallback : value
+}
+
+// Public base URL for QR codes / absolute links. Falls back to the current
+// browsing origin when a site has not set one.
+export async function getSiteBaseUrl() {
+  return getSetting('site_base_url', window.location.origin)
+}
+
+// Facility name shown on the shopfloor dashboard.
+export async function getFacilityName() {
+  return getSetting('facility_name', 'West Jefferson')
+}