Refactor helper functions and update seeders

- Simplified `tmpostChannel` and `tmpostDefaultInventory` functions by removing caching logic.
- Changed return type of `namesWithTaxes` method in `CategoryRepository` to `mixed`.
- Enabled `ProductsTableSeeder` and added user association logic for product relations.
- Updated `BrandsSeeder` to include the product ID in the slug.
- Added `old_customer_id` to `options` in `SellersTableSeeder` for user tracking.

database/seeders/new/SellersTableSeeder.php

@@ -26,6 +26,7 @@ class SellersTableSeeder extends Seeder
                     'email' => $data->email,
                     'phone_number' => Str::after($data->phone, '993'),
                     'password' => Hash::make('12345678'),
+                    'options' => sprintf('{"old_customer_id":"%s"}', $data->id),
                 ]);
 
                 $user->assignRole('vendor');