feat: Add IT Support catalog and related migrations, seeders, and email templates

- Created migration to add 'group_label' to 'product_type_fields' table.
- Implemented ItSupportCatalogSeeder to populate IT Support features and tiers.
- Added ProductCategorySeeder for initial product categories.
- Developed ProductMockupSeeder for mockup products in various categories.
- Introduced ProductTypeFieldSeeder to define fields for different product types.
- Created email templates for VPS service information and service renewal reminders.

app/Http/Requests/ProductTypeField/ProductTypeFieldRequest.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace App\Http\Requests\ProductTypeField;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class ProductTypeFieldRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        $sometimes = $this->isMethod('put') || $this->isMethod('patch') ? 'sometimes|' : '';
+
+        return [
+            'product_type' => $sometimes . 'required|string|max:50',
+            'group_label'  => 'nullable|string|max:255',
+            'key'          => $sometimes . 'required|string|max:255',
+            'label'        => $sometimes . 'required|string|max:255',
+            'field_type'   => $sometimes . 'required|string|in:text,number,textarea,repeater',
+            'sort_order'   => 'nullable|integer',
+            'is_required'  => 'boolean',
+        ];
+    }
+}