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/SettingsIndex.vue

@@ -25,7 +25,10 @@
 </template>
 
 <script setup>
-import { settingsGroups as groups } from './settingsNav'
+import { useSettingsCatalog } from '../../composables/settingsCatalog'
+
+// Core settings groups merged with plugin-contributed cards (ADR-010).
+const { groups } = useSettingsCatalog()
 </script>
 
 <style scoped>