fix(ui) : remove legacy edit pages and history composables, unify create/edit forms

Consolidate create and edit pages into single create pages with edit mode support.
Remove obsolete catalog pages, history composables, and fix remaining code review issues.
Include migration to relink orphaned custom fields.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/app/pages/machine/[id].vue

@@ -54,7 +54,7 @@
               @update:constructeur-links="d.constructeurLinks.value = $event"
               @remove-constructeur-link="handleRemoveConstructeurLink"
               @set-custom-field-value="d.setMachineCustomFieldValue"
-              @custom-fields-saved="() => { d.loadMachineData(); refreshVersions() }"
+              @custom-fields-saved="() => { if (!isSavingMachine) { d.loadMachineData(); refreshVersions() } }"
             />
             <MachineProductsCard
               v-if="d.isEditMode.value || d.machineDirectProducts.value.length > 0"
@@ -226,6 +226,7 @@ const d = useMachineDetailData(machineId)
 const machineInfoCardRef = ref<{ saveFieldDefinitions?: () => Promise<void> } | null>(null)
 const versionRefreshKey = ref(0)
 const refreshVersions = () => { versionRefreshKey.value++ }
+const isSavingMachine = ref(false)
 const { confirm: confirmDialog } = useConfirm()
 
 const versionListRef = ref<InstanceType<typeof EntityVersionList> | null>(null)
@@ -315,11 +316,16 @@ const handleFillEntity = (linkId: string, entityKind: string, modelTypeId: strin
 }
 
 const submitMachineEdition = async () => {
-  if (machineInfoCardRef.value?.saveFieldDefinitions) {
-    await machineInfoCardRef.value.saveFieldDefinitions()
+  isSavingMachine.value = true
+  try {
+    if (machineInfoCardRef.value?.saveFieldDefinitions) {
+      await machineInfoCardRef.value.saveFieldDefinitions()
+    }
+    await d.submitEdition()
+    refreshVersions()
+  } finally {
+    isSavingMachine.value = false
   }
-  await d.submitEdition()
-  refreshVersions()
 }
 
 const confirmRemoveProduct = async (id: string) => {