feat: Enhance product support in Cart and OrderItem models

- Added new fields 'billing_cycle' and 'product_pricing_id' to Cart and OrderItem models.
- Updated product retrieval logic to support both new and legacy systems.
- Introduced relationships for Product and ProductPricings in Cart and OrderItem models.
- Created migration to add new fields to the carts and order_item tables.
- Updated frontend service index to handle new pricing structure and billing cycles.
- Improved UI components for better user experience in product selection and pricing display.
- Refactored action buttons in various views for consistency and improved styling.

resources/views/administrator/pages/block/ModuleVCenter.blade.php

@@ -1,12 +1,12 @@
-<x-button-crm type="button" variant="primary" size="sm" route="module.vcenter.create" icon="plus-circle">Add
+<x-button-crm type="button" variant="outline-primary" size="sm" route="module.vcenter.create" icon="plus-circle">Add
     Server</x-button-crm>
 <form action="{{ route('module.vcenter.import') }}" class="d-lg-inline" enctype="multipart/form-data" method="post">
     @csrf
     <input type="file" name="file" class="d-none file-selector"
         accept=".csv,application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" onchange="form.submit()" />
-    <x-button-crm type="button" variant="success" size="sm" route="module.vcenter.import" icon="plus-circle">Import
+    <x-button-crm type="button" variant="outline-info" size="sm" route="module.vcenter.import" icon="plus-circle">Import
         From
         Excel</x-button-crm>
 </form>
-<x-button-crm type="button" variant="secondary" size="sm" url="file/vCenter.xlsx" icon="download">File Import
+<x-button-crm type="button" variant="outline-secondary" size="sm" url="file/vCenter.xlsx" icon="download">File Import
     Demo</x-button-crm>