feat(machine) : single save button + link versioning display

- Replace auto-save-on-blur with single "Enregistrer" button
- Add Cancel button that resets local state
- Expose saveFieldDefinitions via defineExpose on MachineInfoCard
- Remove standalone save button from MachineCustomFieldDefEditor
- Add saveAllMachineCustomFields batch method
- Add submitEdition/cancelEdition/saving/canSubmit to orchestrator
- Show diff summary badges in version list entries
- Show link changes in restore modal description

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

app/components/common/VersionRestoreModal.vue

@@ -26,6 +26,7 @@
                     <li>Nom, reference, prix</li>
                     <li>Site</li>
                     <li>Fournisseurs</li>
+                    <li>Composants, pieces et produits lies</li>
                     <li>Champs personnalises</li>
                   </ul>
                 </template>