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/SettingsLayout.vue

@@ -36,17 +36,20 @@
 <script setup>
 import { ref, computed } from 'vue'
 import { useRoute } from 'vue-router'
-import { settingsGroups as groups } from './settingsNav'
+import { useSettingsCatalog } from '../../composables/settingsCatalog'
 
 const route = useRoute()
 
+// Core settings groups merged with plugin-contributed cards (ADR-010).
+const { groups } = useSettingsCatalog()
+
 const search = ref('')
 
 // Filter the rail by title/description; drop groups that end up empty.
 const visibleGroups = computed(() => {
   const term = search.value.trim().toLowerCase()
-  if (!term) return groups
-  return groups
+  if (!term) return groups.value
+  return groups.value
     .map(g => ({
       title: g.title,
       cards: g.cards.filter(c =>