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/composables/mapConfig.js

@@ -0,0 +1,68 @@
+// Facility floor-map blueprint config, read from the settings table so each
+// site instance (ADR-004) renders its own floor plan instead of a hardcoded
+// one. Keys: map_blueprint_light, map_blueprint_dark, map_width, map_height.
+// Missing keys fall back to the West Jefferson sitemap so a fresh or offline
+// install still renders.
+import { reactive } from 'vue'
+import { settingsApi } from '../api'
+
+// Fallback defaults - the original hardcoded West Jefferson values.
+const DEFAULTS = {
+  blueprintLight: '/static/images/sitemap2025-light.png',
+  blueprintDark: '/static/images/sitemap2025-dark.png',
+  width: 3300,
+  height: 2550
+}
+
+// Shared reactive config. Import as `state` to read width/height/blueprint.
+export const state = reactive({ ...DEFAULTS, loaded: false })
+
+let inflight = null
+
+function applySetting(key, value) {
+  if (value === null || value === undefined || value === '') return
+  if (key === 'map_blueprint_light') state.blueprintLight = value
+  else if (key === 'map_blueprint_dark') state.blueprintDark = value
+  else if (key === 'map_width') {
+    const n = parseInt(value, 10)
+    if (!isNaN(n) && n > 0) state.width = n
+  } else if (key === 'map_height') {
+    const n = parseInt(value, 10)
+    if (!isNaN(n) && n > 0) state.height = n
+  }
+}
+
+function fetchConfig() {
+  inflight = settingsApi.list({ category: 'map' })
+    .then(({ data }) => {
+      ;(data.data || []).forEach(s => applySetting(s.key, s.value))
+      state.loaded = true
+    })
+    .catch(() => { state.loaded = true })
+    .finally(() => { inflight = null })
+  return inflight
+}
+
+// Fetch the map config once (shared across all map components). Returns a
+// promise that resolves when state is populated, so a caller can await it
+// before initializing a Leaflet map that needs the dimensions.
+export function loadMapConfig() {
+  if (state.loaded) return Promise.resolve()
+  if (inflight) return inflight
+  return fetchConfig()
+}
+
+// Re-read config from the server after a map setting changes.
+export function reloadMapConfig() {
+  return fetchConfig()
+}
+
+// Blueprint image URL for the given theme ('light' | 'dark').
+export function blueprintUrlFor(theme) {
+  return theme === 'light' ? state.blueprintLight : state.blueprintDark
+}
+
+export function useMapConfig() {
+  loadMapConfig()
+  return { state, blueprintUrlFor }
+}