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/views/settings/settingsNav.js

@@ -0,0 +1,85 @@
+// Shared settings navigation catalog.
+// Used by SettingsLayout (left rail) and SettingsIndex (landing overview) so the
+// grouping lives in one place.
+import { Factory, MapPin, Tag, Package, Droplets, Monitor, MonitorSmartphone, Laptop, Cog, Building, Globe, Link, Settings, FileText, Users, Puzzle, Bell, Network, Home, Wrench, Printer, Router, Palette, SlidersHorizontal } from 'lucide-vue-next'
+
+export const settingsGroups = [
+  {
+    title: 'Site & Facility',
+    cards: [
+      { to: '/settings/site', icon: Home, title: 'Site & Facility', description: 'Site URL/FQDN, facility name, and PC access domain' },
+      { to: '/settings/system?tab=map', icon: MapPin, title: 'Floor Map', description: 'Facility floor-plan blueprint and dimensions' },
+    ],
+  },
+  {
+    title: 'General Reference',
+    cards: [
+      { to: '/settings/vendors', icon: Factory, title: 'Vendors', description: 'Manage equipment vendors and manufacturers' },
+      { to: '/settings/models', icon: Package, title: 'Models', description: 'Manage equipment models by vendor' },
+      { to: '/settings/statuses', icon: Tag, title: 'Statuses', description: 'Manage asset status types' },
+      { to: '/settings/relationshiptypes', icon: Link, title: 'Relationship Types', description: 'Manage asset relationship types (Controls, Contains...) + colors' },
+      { to: '/settings/assettypes', icon: Palette, title: 'Asset Type Colors', description: 'Map colors for the top-level asset categories' },
+      { to: '/settings/customfields', icon: SlidersHorizontal, title: 'Custom Fields', description: 'Define extra attributes per asset type (shown on detail + forms)' },
+    ],
+  },
+  {
+    title: 'PCs',
+    cards: [
+      { to: '/settings/pctypes', icon: Laptop, title: 'PC Types', description: 'Manage PC form factors + map colors' },
+      { to: '/settings/operatingsystems', icon: Cog, title: 'Operating Systems', description: 'Manage OS versions and EOL dates' },
+      { to: '/settings/accessprotocols', icon: Network, title: 'PC Access Protocols', description: 'Remote-access protocols (VNC, RDP, WinRM) and link templates' },
+    ],
+  },
+  {
+    title: 'Printers',
+    cards: [
+      { to: '/settings/printertypes', icon: Printer, title: 'Printer Types', description: 'Manage printer subtypes + map colors' },
+      { to: '/settings/modelsupplies', icon: Droplets, title: 'Model Toners and Supplies', description: 'Map toner, drum, and waste part numbers to printer models' },
+      { to: '/settings/printerdrivers', icon: Printer, title: 'Printer Drivers', description: 'Named SMB / HTTP links to printer driver packages' },
+    ],
+  },
+  {
+    title: 'Equipment',
+    cards: [
+      { to: '/settings/equipmenttypes', icon: Wrench, title: 'Equipment Types', description: 'Manage equipment subtypes + map colors' },
+      { to: '/settings/machinetypes', icon: Monitor, title: 'Machine Types', description: 'Manage machine type categories' },
+    ],
+  },
+  {
+    title: 'Locations & Organization',
+    cards: [
+      { to: '/settings/locations', icon: MapPin, title: 'Locations', description: 'Manage physical locations and sites' },
+      { to: '/settings/locationtypes', icon: Tag, title: 'Location Types', description: 'Manage location types + colors' },
+      { to: '/settings/businessunits', icon: Building, title: 'Business Units', description: 'Manage organizational units' },
+    ],
+  },
+  {
+    title: 'Network',
+    cards: [
+      { to: '/settings/networktypes', icon: Router, title: 'Network Device Types', description: 'Manage network device subtypes + map colors' },
+      { to: '/settings/vlans', icon: Globe, title: 'VLANs', description: 'Manage virtual LANs' },
+      { to: '/settings/subnets', icon: Link, title: 'Subnets', description: 'Manage IP subnets and DHCP' },
+    ],
+  },
+  {
+    title: 'Displays & Kiosks',
+    cards: [
+      { to: '/settings/dashboarddefaults', icon: MonitorSmartphone, title: 'Dashboard Defaults', description: 'Map kiosk IPs to a default business unit' },
+      { to: '/settings/notificationtypes', icon: Bell, title: 'Notification Types', description: 'Manage notification types, display styles, colors, and auto-expiry' },
+    ],
+  },
+  {
+    title: 'System',
+    cards: [
+      { to: '/settings/system', icon: Settings, title: 'System Settings', description: 'Integrations, identifiers, search, and PC-type mapping' },
+      { to: '/settings/plugins', icon: Puzzle, title: 'Plugins', description: 'Enable or disable installed plugins' },
+    ],
+  },
+  {
+    title: 'Access & Audit',
+    cards: [
+      { to: '/settings/users', icon: Users, title: 'Users & Roles', description: 'Manage user accounts and permissions' },
+      { to: '/settings/auditlogs', icon: FileText, title: 'Audit Logs', description: 'View system activity and change history' },
+    ],
+  },
+]