fix(custom-fields) : prevent data loss on ModelType save + restoration scripts

Backend: match existing CustomField by name as fallback when ID is not provided,
preventing deletion and recreation of field definitions (which cascade-deletes values).

Includes restoration/migration scripts for prod:
- restore-custom-field-values.php: restores piece values from audit logs
- migrate-orphaned-custom-fields.php: migrates values from orphaned CFs
- fix-prod-all.php: combined fix (migrate + restore + cleanup)
- fix-prod-recreate-and-migrate.php: full fix (recreate missing CFs + migrate + restore)
- check-prod-*.php: diagnostic scripts

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

src/Service/SkeletonStructureService.php

@@ -192,10 +192,12 @@ class SkeletonStructureService
             ['orderIndex' => 'ASC']
         );
 
-        // Index existing by ID for matching
-        $existingById = [];
+        // Index existing by ID and by name for matching
+        $existingById   = [];
+        $existingByName = [];
         foreach ($existingFields as $cf) {
-            $existingById[$cf->getId()] = $cf;
+            $existingById[$cf->getId()]     = $cf;
+            $existingByName[$cf->getName()] = $cf;
         }
 
         $processedIds = [];
@@ -204,11 +206,13 @@ class SkeletonStructureService
             // Normalize both formats to a common shape
             $normalized = $this->normalizeCustomFieldData($fieldData, $i);
 
-            // Try to match an existing field by ID
+            // Try to match an existing field by ID first, then by name as fallback
             $existingField = null;
             $fieldId       = $fieldData['customFieldId'] ?? $fieldData['id'] ?? null;
             if ($fieldId && isset($existingById[$fieldId])) {
                 $existingField = $existingById[$fieldId];
+            } elseif (isset($existingByName[$normalized['name']]) && !isset($processedIds[$existingByName[$normalized['name']]->getId()])) {
+                $existingField = $existingByName[$normalized['name']];
             }
 
             if ($existingField) {