Revert "fix: resolve PHPStan static analysis warnings"

This reverts commit 2d3e4b4a95.

app/Http/Resources/OrderResource.php

@@ -2,14 +2,10 @@
 
 namespace App\Http\Resources;
 
-use App\Models\Order;
 use App\Services\PlanService;
 use Illuminate\Http\Request;
 use Illuminate\Http\Resources\Json\JsonResource;
 
-/**
- * @mixin Order
- */
 class OrderResource extends JsonResource
 {
     /**
@@ -21,8 +17,8 @@ class OrderResource extends JsonResource
     {
         return [
             ...parent::toArray($request),
-            'period' => PlanService::getLegacyPeriod((string)$this->period),
-            'plan' => $this->whenLoaded('plan', fn() => PlanResource::make($this->plan)),
+            'period' => PlanService::getLegacyPeriod($this->period),
+            'plan' => PlanResource::make($this->plan),
         ];
     }
 }