feat: [품질관리] 수주선택 API에 발주처(client_name) 필드 추가

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Services/QualityDocumentService.php

@@ -365,6 +365,7 @@ public function availableOrders(array $params): array
                 'id' => $order->id,
                 'order_number' => $order->order_no,
                 'site_name' => $order->site_name ?? '',
+                'client_name' => $order->client_name ?? '',
                 'delivery_date' => $order->delivery_date?->format('Y-m-d') ?? '',
                 'location_count' => $order->location_count,
             ])