fix(custom-fields) : persist machineContextOnly in structure save and clone

- SkeletonStructureService: read and write machineContextOnly on create/update
- normalizeCustomFieldData: pass machineContextOnly through both payload formats
- cloneCustomFields: copy machineContextOnly flag on machine clone

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

src/Controller/MachineStructureController.php

@@ -191,6 +191,7 @@ class MachineStructureController extends AbstractController
             $newCf->setDefaultValue($cf->getDefaultValue());
             $newCf->setOptions($cf->getOptions());
             $newCf->setOrderIndex($cf->getOrderIndex());
+            $newCf->setMachineContextOnly($cf->isMachineContextOnly());
             $newCf->setMachine($target);
             $this->entityManager->persist($newCf);
 

src/Service/SkeletonStructureService.php

@@ -233,6 +233,7 @@ class SkeletonStructureService
                 $existingField->setOptions($normalized['options']);
                 $existingField->setDefaultValue($normalized['defaultValue']);
                 $existingField->setOrderIndex($normalized['orderIndex']);
+                $existingField->setMachineContextOnly($normalized['machineContextOnly']);
                 $processedIds[$existingField->getId()] = true;
             } else {
                 // Create new field
@@ -243,6 +244,7 @@ class SkeletonStructureService
                 $cf->setOptions($normalized['options']);
                 $cf->setDefaultValue($normalized['defaultValue']);
                 $cf->setOrderIndex($normalized['orderIndex']);
+                $cf->setMachineContextOnly($normalized['machineContextOnly']);
 
                 match ($category) {
                     ModelCategory::COMPONENT => $cf->setTypeComposant($modelType),
@@ -265,7 +267,7 @@ class SkeletonStructureService
     /**
      * Normalize frontend custom field data to a common shape.
      *
-     * @return array{name: string, type: string, required: bool, options: ?array, defaultValue: ?string, orderIndex: int}
+     * @return array{name: string, type: string, required: bool, options: ?array, defaultValue: ?string, orderIndex: int, machineContextOnly: bool}
      */
     private function normalizeCustomFieldData(array $fieldData, int $index): array
     {
@@ -280,6 +282,7 @@ class SkeletonStructureService
                 'options'            => $value['options'] ?? null,
                 'defaultValue'       => $value['defaultValue'] ?? null,
                 'orderIndex'         => $index,
+                'machineContextOnly' => (bool) ($value['machineContextOnly'] ?? false),
             ];
         }
 
@@ -291,6 +294,7 @@ class SkeletonStructureService
             'options'            => $fieldData['options'] ?? null,
             'defaultValue'       => $fieldData['defaultValue'] ?? null,
             'orderIndex'         => $fieldData['orderIndex'] ?? $index,
+            'machineContextOnly' => (bool) ($fieldData['machineContextOnly'] ?? false),
         ];
     }
 }