refactor(machines) : remove TypeMachine skeleton system, simplify machine creation

- Remove TypeEdit*, TypeInfoDisplay, MachineSkeletonSummary, MachineCreatePreview components
- Remove machine-skeleton pages and type pages
- Remove useMachineTypesApi, useMachineSkeletonEditor, useMachineCreateSelections composables
- Add AddEntityToMachineModal for direct entity linking
- Update machine detail/create pages for direct custom fields
- Fix SearchSelect, category display, and ipartial search filters

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/components/layout/AppNavbar.vue

@@ -251,7 +251,7 @@ import IconLucideChevronRight from '~icons/lucide/chevron-right'
 import IconLucideLogOut from '~icons/lucide/log-out'
 import IconLucideLayoutDashboard from '~icons/lucide/layout-dashboard'
 import IconLucideFactory from '~icons/lucide/factory'
-import IconLucideClipboardList from '~icons/lucide/clipboard-list'
+
 import IconLucideCpu from '~icons/lucide/cpu'
 import IconLucidePuzzle from '~icons/lucide/puzzle'
 import IconLucidePackage from '~icons/lucide/package'
@@ -280,7 +280,6 @@ interface NavGroup {
 const simpleLinks: NavLink[] = [
   { to: '/', label: 'Vue d\'ensemble', icon: IconLucideLayoutDashboard },
   { to: '/machines', label: 'Parc Machines', icon: IconLucideFactory },
-  { to: '/machine-skeleton', label: 'Squelettes', icon: IconLucideClipboardList },
 ]
 
 const navGroups: NavGroup[] = [