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/TVDashboard.vue

@@ -66,12 +66,13 @@ onUnmounted(() => {
 
 async function fetchSlides() {
   try {
-    const response = await api.get('/slides')
+    // Flat feed shape: { success, surface, basepath, interval, slides:[...] }
+    const response = await api.get('/slides/feed', { params: { surface: 'lobby' } })
     const data = response.data
 
-    if (data.success && data.data?.slides?.length > 0) {
-      slides.value = data.data.slides
-      basePath.value = data.data.basepath || '/static/slides/'
+    if (data.success && data.slides?.length > 0) {
+      slides.value = data.slides
+      basePath.value = data.basepath || '/api/slides/img/lobby/'
       error.value = ''
 
       // Restart slideshow if slides changed
@@ -79,7 +80,8 @@ async function fetchSlides() {
         startSlideshow()
       }
     } else {
-      error.value = data.message || 'No slides found'
+      slides.value = []
+      error.value = 'No slides configured'
     }
   } catch (err) {
     console.error('Error fetching slides:', err)