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-audit-dates.php

@@ -0,0 +1,46 @@
+<?php
+
+declare(strict_types=1);
+
+require_once __DIR__.'/../vendor/autoload.php';
+
+use Doctrine\DBAL\DriverManager;
+
+$conn = DriverManager::getConnection([
+    'driver' => 'pdo_pgsql',
+    'host' => 'localhost',
+    'port' => 5432,
+    'dbname' => 'inventory',
+    'user' => 'ferme_user',
+    'password' => 'fermerecette',
+]);
+
+echo "--- Audit logs with customField deletions (to:null) ---\n";
+$rows = $conn->fetchAllAssociative("
+    SELECT al.entityid, al.entitytype, al.diff::text as diff, al.createdat
+    FROM audit_logs al
+    WHERE al.diff::text LIKE '%customField%'
+      AND al.diff::text LIKE '%\"to\":null%'
+    ORDER BY al.createdat DESC
+    LIMIT 20
+");
+echo sprintf("Found %d entries\n\n", count($rows));
+foreach ($rows as $r) {
+    echo sprintf("[%s] %s %s: %s\n", $r['createdat'], $r['entitytype'], $r['entityid'], substr($r['diff'], 0, 120));
+}
+
+echo "\n--- Orphaned CFValues (pointing to CFs with no ModelType) ---\n";
+$rows = $conn->fetchAllAssociative("
+    SELECT COUNT(*) as cnt,
+           CASE WHEN cfv.pieceid IS NOT NULL THEN 'piece'
+                WHEN cfv.composantid IS NOT NULL THEN 'composant'
+                WHEN cfv.productid IS NOT NULL THEN 'product'
+                ELSE 'unknown' END as entity_type
+    FROM custom_field_values cfv
+    JOIN custom_fields cf ON cf.id = cfv.customfieldid
+    WHERE cf.typecomposantid IS NULL AND cf.typepieceid IS NULL AND cf.typeproductid IS NULL
+    GROUP BY entity_type
+");
+foreach ($rows as $r) {
+    echo sprintf("  %s: %d orphaned values\n", $r['entity_type'], $r['cnt']);
+}