Accept + implement ADR-010 frontend plugin hooks (contract 0.7.0)

Four data-only hooks on BasePlugin (get_settings_cards,
get_asset_panels, get_map_overlays, get_asset_presentation) with a
GET-only /api/pluginui consumer surface copying the dashboard-widgets
semantics. Pilots: warranty declares its asset panel; measuringtools
supplies its settings card, presentation, and calibration overlay -
the last hardcoded settings-nav entry is now hook-sourced. Generic
renderers for panels/overlays/presentation deferred per the ADR's
incremental adoption plan (documented in CONTRACT-STABILITY.md).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend/src/views/settings/settingsNav.js

@@ -1,7 +1,7 @@
 // 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, Contact, Ruler } from 'lucide-vue-next'
+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, Contact } from 'lucide-vue-next'
 
 export const settingsGroups = [
   {
@@ -46,12 +46,9 @@ export const settingsGroups = [
       { to: '/settings/machinetypes', icon: Wrench, title: 'Machine Types', description: 'Manage machine subtypes + map colors' },
     ],
   },
-  {
-    title: 'Measuring Tools',
-    cards: [
-      { to: '/settings/measuringtooltypes', icon: Ruler, title: 'Measuring Tool Types', description: 'Manage measuring-tool subtypes (caliper, micrometer, thread gage...) + map colors' },
-    ],
-  },
+  // The "Measuring Tools" group is contributed by the measuringtools plugin via
+  // the ADR-010 get_settings_cards hook (merged in composables/settingsCatalog),
+  // not hardcoded here.
   {
     title: 'Locations & Organization',
     cards: [