feat(service): detach/attach service to customer with activity log

- Customer tab "delete" no longer deletes the service: it detaches the
  customer, discards the order/invoices and logs a `detached` activity
  with the previous customer and order.
- New POST customers/{uuid}/services/attach assigns an unassigned
  service (GET services?unassigned=1) to a customer, creating a pending
  order + unpaid invoice when missing, and logs `attached`.
- Detach/attach also sync module_vmware/module_hosting_accounts
  customer_id: ResolvesVm authorises by module_vmware.customer_id, so a
  detached customer could still control the VM.
- /services detach-customer (single + bulk) go through the same path.
- GET services/{id} returns the service activity logs.

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

app/Http/Controllers/Api/Admin/Customer/Concerns/ManagesCustomerServices.php

@@ -14,13 +14,22 @@ trait ManagesCustomerServices
         return response()->json(['error' => false, 'data' => $this->serviceProvisioning->getServices($uuid)]);
     }
 
+    public function attachService(string $uuid, Request $request): JsonResponse
+    {
+        $data = $request->validate(['service_id' => 'required|integer|exists:services,id']);
+
+        $service = $this->serviceProvisioning->attachService($uuid, $data['service_id']);
+
+        return response()->json(['error' => false, 'message' => 'Đã gán dịch vụ cho khách hàng', 'data' => $service]);
+    }
+
     public function bulkDeleteServices(string $uuid, Request $request): JsonResponse
     {
         $data = $request->validate(['ids' => 'required|array|min:1', 'ids.*' => 'integer']);
 
         $deleted = $this->serviceProvisioning->bulkDeleteServices($uuid, $data['ids']);
 
-        return response()->json(['error' => false, 'message' => "Đã xoá {$deleted} dịch vụ", 'data' => ['deleted' => $deleted]]);
+        return response()->json(['error' => false, 'message' => "Đã gỡ {$deleted} dịch vụ khỏi khách hàng", 'data' => ['deleted' => $deleted]]);
     }
 
     public function updateService(string $uuid, int $serviceId, Request $request): JsonResponse

app/Http/Controllers/Api/Admin/Service/ServiceController.php

@@ -5,14 +5,19 @@ namespace App\Http\Controllers\Api\Admin\Service;
 use App\Helpers\OrderHelper;
 use App\Http\Controllers\Controller;
 use App\Jobs\VirtualMachine\Provision\ResendVmCredentialsEmailJob;
+use App\Models\ActivityLog;
 use App\Models\DomainPricing;
 use App\Models\ModuleVmware;
 use App\Models\Service;
+use App\Services\Customer\CustomerServiceAssignment;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
+use Illuminate\Support\Facades\DB;
 
 class ServiceController extends Controller
 {
+    public function __construct(private readonly CustomerServiceAssignment $assignment) {}
+
     public function index(Request $request): JsonResponse
     {
         $perPage = min((int) ($request->per_page ?? 15), 100);
@@ -21,7 +26,8 @@ class ServiceController extends Controller
             ->where(fn($q) => $q->whereNull('order_item_id')->orWhereNull('type')->orWhere('type', '!=', 'domain'))
             ->when($request->filter, fn($q, $v) => $q->where('server_name', 'like', "%{$v}%"))
             ->when($request->status,  fn($q, $v) => $q->where('status', $v))
-            ->when($request->customer_id, fn($q, $v) => $q->where('customer_id', $v));
+            ->when($request->customer_id, fn($q, $v) => $q->where('customer_id', $v))
+            ->when($request->boolean('unassigned'), fn($q) => $q->whereNull('customer_id'));
 
         $paginator = $query->latest()->paginate($perPage);
 
@@ -71,6 +77,12 @@ class ServiceController extends Controller
 
         ModuleVmware::resolveVirtualMachineIds([$service->vmware]);
 
+        $service->setAttribute('activity_logs', ActivityLog::where('subject_type', Service::class)
+            ->where('subject_id', $service->id)
+            ->latest('id')
+            ->limit(50)
+            ->get(['id', 'event', 'description', 'causer_type', 'causer_name', 'old_values', 'new_values', 'created_at']));
+
         return response()->json(['error' => false, 'data' => $service]);
     }
 
@@ -82,14 +94,17 @@ class ServiceController extends Controller
             'action' => 'required|in:activate,suspend,cancel,detach-customer',
         ]);
 
-        $updates = match ($data['action']) {
-            'activate' => ['status' => 'active', 'suspended_at' => null, 'cancelled_at' => null],
-            'suspend' => ['status' => 'suspended', 'suspended_at' => now()],
-            'cancel' => ['status' => 'cancelled', 'cancelled_at' => now()],
-            'detach-customer' => ['customer_id' => null],
-        };
+        if ($data['action'] === 'detach-customer') {
+            $updated = $this->detachCustomers($data['ids']);
+        } else {
+            $updates = match ($data['action']) {
+                'activate' => ['status' => 'active', 'suspended_at' => null, 'cancelled_at' => null],
+                'suspend' => ['status' => 'suspended', 'suspended_at' => now()],
+                'cancel' => ['status' => 'cancelled', 'cancelled_at' => now()],
+            };
 
-        $updated = Service::whereIn('id', $data['ids'])->update($updates);
+            $updated = Service::whereIn('id', $data['ids'])->update($updates);
+        }
 
         return response()->json([
             'error' => false,
@@ -100,12 +115,21 @@ class ServiceController extends Controller
 
     public function detachCustomer(int $id): JsonResponse
     {
-        $service = Service::findOrFail($id);
-        $service->update(['customer_id' => null]);
+        $this->detachCustomers([Service::findOrFail($id)->id]);
 
         return response()->json(['error' => false, 'message' => 'Đã gỡ khách hàng khỏi dịch vụ.']);
     }
 
+    private function detachCustomers(array $ids): int
+    {
+        return DB::transaction(function () use ($ids) {
+            $services = Service::with('customer')->whereIn('id', $ids)->whereNotNull('customer_id')->get();
+            $services->each(fn (Service $service) => $this->assignment->detach($service));
+
+            return $services->count();
+        });
+    }
+
     public function resendCredentials(int $id): JsonResponse
     {
         $service = Service::findOrFail($id);