fix(data-integrity) : prevent data loss in clone, slots, conversion and custom fields

- Clone: CustomFieldValue now references cloned CustomField, not source
- Slots: validate piece type matches slot requirement + 404 on missing piece
- Conversion: check slot tables before allowing category conversion + clean orphan skeleton requirements
- CustomFieldValue: prevent creation of orphan CustomField without target entity

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

src/Controller/ComposantPieceSlotController.php

@@ -43,6 +43,18 @@ class ComposantPieceSlotController extends AbstractController
                 $slot->setSelectedPiece(null);
             } else {
                 $piece = $this->entityManager->find(Piece::class, $payload['selectedPieceId']);
+                if (!$piece) {
+                    return $this->json(['success' => false, 'error' => 'Pièce introuvable.'], 404);
+                }
+
+                $slotTypePiece = $slot->getTypePiece();
+                if ($slotTypePiece && $piece->getTypePiece()?->getId() !== $slotTypePiece->getId()) {
+                    return $this->json([
+                        'success' => false,
+                        'error'   => sprintf('La pièce doit être de type « %s ».', $slotTypePiece->getName()),
+                    ], 422);
+                }
+
                 $slot->setSelectedPiece($piece);
             }
         }

src/Controller/CustomFieldValueController.php

@@ -196,19 +196,16 @@ class CustomFieldValueController extends AbstractController
             return $this->json(['success' => false, 'error' => 'customFieldId or customFieldName is required.'], 400);
         }
 
-        $customField = new CustomField();
-        $customField->setName($customFieldName);
-        $customField->setType((string) ($payload['customFieldType'] ?? 'text'));
-        $customField->setRequired((bool) ($payload['customFieldRequired'] ?? false));
-
-        $options = $payload['customFieldOptions'] ?? null;
-        if (is_array($options)) {
-            $customField->setOptions($options);
+        // Try to find an existing custom field by name instead of creating an orphan
+        $existing = $this->customFieldRepository->findOneBy(['name' => $customFieldName]);
+        if ($existing instanceof CustomField) {
+            return $existing;
         }
 
-        $this->entityManager->persist($customField);
-
-        return $customField;
+        return $this->json([
+            'success' => false,
+            'error'   => sprintf('Custom field "%s" not found. Create it explicitly first.', $customFieldName),
+        ], 404);
     }
 
     private function resolveTarget(array $payload): array|JsonResponse

src/Controller/MachineStructureController.php

@@ -173,6 +173,8 @@ class MachineStructureController extends AbstractController
 
     private function cloneCustomFields(Machine $source, Machine $target): void
     {
+        $cfMap = [];
+
         foreach ($source->getCustomFields() as $cf) {
             $newCf = new CustomField();
             $newCf->setName($cf->getName());
@@ -183,12 +185,20 @@ class MachineStructureController extends AbstractController
             $newCf->setOrderIndex($cf->getOrderIndex());
             $newCf->setMachine($target);
             $this->entityManager->persist($newCf);
+
+            $cfMap[$cf->getId()] = $newCf;
         }
 
         foreach ($source->getCustomFieldValues() as $cfv) {
+            $originalCf = $cfv->getCustomField();
+            $newCf      = $cfMap[$originalCf->getId()] ?? null;
+            if (!$newCf) {
+                continue;
+            }
+
             $newValue = new CustomFieldValue();
             $newValue->setMachine($target);
-            $newValue->setCustomField($cfv->getCustomField());
+            $newValue->setCustomField($newCf);
             $newValue->setValue($cfv->getValue());
             $this->entityManager->persist($newValue);
         }