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>

scripts/check-prod-values.php

@@ -0,0 +1,36 @@
+<?php
+
+declare(strict_types=1);
+
+require_once __DIR__.'/../vendor/autoload.php';
+
+use Doctrine\DBAL\DriverManager;
+
+$conn = DriverManager::getConnection([
+    'driver'   => 'pdo_pgsql',
+    'host'     => 'localhost',
+    'port'     => 5432,
+    'dbname'   => 'inventory',
+    'user'     => 'ferme_user',
+    'password' => 'fermerecette',
+]);
+
+echo "--- Piece 'Arbre du palier pied E1' ---\n";
+$rows = $conn->fetchAllAssociative("SELECT p.name, cfv.value, cf.name as field_name FROM pieces p JOIN custom_field_values cfv ON cfv.pieceid = p.id JOIN custom_fields cf ON cf.id = cfv.customfieldid WHERE p.id = 'cl3d978dd4b071daff8fb185f7' ORDER BY cf.orderindex");
+foreach ($rows as $r) {
+    echo sprintf("  %s: '%s'\n", $r['field_name'], $r['value']);
+}
+
+echo "\n--- Composant 'Cage écureuil pied E8' ---\n";
+$rows = $conn->fetchAllAssociative("SELECT c.name, cfv.value, cf.name as field_name FROM composants c JOIN custom_field_values cfv ON cfv.composantid = c.id JOIN custom_fields cf ON cf.id = cfv.customfieldid WHERE c.id = 'cl5b5e336095de8d4ece81b2dc' ORDER BY cf.orderindex");
+foreach ($rows as $r) {
+    echo sprintf("  %s: '%s'\n", $r['field_name'], $r['value']);
+}
+
+echo "\n--- Count empty piece values (ModelType Arbre) ---\n";
+$count = $conn->fetchOne("SELECT COUNT(*) FROM pieces p JOIN custom_field_values cfv ON cfv.pieceid = p.id WHERE p.typepieceid = 'cmgujpyjf002q4705j6hv1nkk' AND (cfv.value = '' OR cfv.value IS NULL)");
+echo sprintf("  Empty values: %d\n", $count);
+
+echo "\n--- Count orphaned CustomField definitions ---\n";
+$count = $conn->fetchOne('SELECT COUNT(*) FROM custom_fields WHERE typecomposantid IS NULL AND typepieceid IS NULL AND typeproductid IS NULL');
+echo sprintf("  Orphaned CFs: %d\n", $count);