fix: trả rows_by_host cho network trong cây vCenter

Network dùng chung giữa các host bị unique('network') giữ lại host đầu tiên.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

app/Http/Controllers/Api/Admin/VCenter/VCenterController.php

@@ -205,7 +205,8 @@ class VCenterController extends Controller
                 // Networks — deduplicated at datacenter level
                 $dcNetworks = $uniqueHosts
                     ->flatMap(fn($host) => $host->network ?? collect())
-                    ->unique('network')
+                    ->groupBy('network')
+                    ->map(fn($nets) => $nets->first()->setAttribute('rows_by_host', $nets->pluck('id', 'module_host_id')))
                     ->map(fn($net) => [
                         'id'   => 'network-' . $net->id,
                         'name' => $net->name,
@@ -215,6 +216,7 @@ class VCenterController extends Controller
                             'network' => $net->network,
                             'net_type' => $net->type,
                             'module_host_id' => $net->module_host_id,
+                            'rows_by_host' => $net->rows_by_host,
                             'status' => $net->status,
                         ],
                     ]);