refactor(sales): replace service with command and action pattern

- Replace SaleService with CreateSaleCommand and CreateSaleAction for better separation of concerns
- Move sale creation logic into dedicated command class following command pattern
- Update CreateSale.php to use new action instead of direct service call
- Wrap sale creation in database transaction for data consistency

app/Actions/Sales/CreateSaleAction.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace App\Actions\Sales;
+
+use App\Commands\Sales\CreateSaleCommand;
+use App\Models\Sale;
+
+class CreateSaleAction
+{
+    /**
+     * Create a new class instance.
+     */
+    public function __construct(private CreateSaleCommand $createSaleCommand)
+    {
+        //
+    }
+
+    public function __invoke(array $data): Sale
+    {
+        return $this->createSaleCommand->execute($data);
+    }
+}