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/machines/MachineDetail.vue

@@ -129,14 +129,6 @@
                   </span>
                 </span>
               </div>
-              <div class="info-row">
-                <span class="info-label">Location Only</span>
-                <span class="info-value">
-                  <span class="feature-tag" :class="{ active: equipment.equipment?.islocationonly }">
-                    {{ equipment.equipment?.islocationonly ? 'Yes' : 'No' }}
-                  </span>
-                </span>
-              </div>
             </div>
           </div>
 
@@ -211,6 +203,12 @@
             </div>
           </div>
 
+          <!-- Custom Fields -->
+          <CustomFieldsSection :assetid="equipment.assetid" />
+
+          <!-- Warranty -->
+          <WarrantyPanel :assetid="equipment.assetid" />
+
           <!-- Notes -->
           <div class="section-card" v-if="equipment.notes">
             <h3 class="section-title">Notes</h3>
@@ -237,6 +235,8 @@ import { ref, computed, onMounted } from 'vue'
 import { useRoute } from 'vue-router'
 import { equipmentApi, assetsApi } from '../../api'
 import LocationMapTooltip from '../../components/LocationMapTooltip.vue'
+import CustomFieldsSection from '../../components/CustomFieldsSection.vue'
+import WarrantyPanel from '../../components/WarrantyPanel.vue'
 import { useIdentifierFlags } from '../../composables/identifierSettings'
 
 const route = useRoute()