fix(installments): نوع الورقة في enum هو check مش cheque

app/Modules/Installments/Services/ChequeService.php

@@ -160,7 +160,7 @@ final class ChequeService
         foreach ($cheques as $chq) {
             try {
                 $instrumentId = $db->insert('negotiable_instruments', [
-                    'instrument_type'   => 'cheque',
+                    'instrument_type'   => 'check',   // قيمة الـ enum الفعلية
                     'direction'         => 'receivable',
                     'instrument_number' => (string) ($chq['cheque_number'] ?? ('INST-' . $chq['id'])),
                     'amount'            => (string) $chq['cheque_amount'],