refactor(client): extract base account generation to command

Move the logic for generating base accounts for a new client from the ClientObserver into a dedicated command class (GenerateBaseAccountCommand). This improves code organization and reusability.

- The command is now used in the ClientObserver::created method.
- The command is also made available as a manual action in the AccountsRelationManager table header, allowing admins to generate base accounts for existing clients that lack them.
- Added necessary imports to the CreateSale page, though the command is not directly used there in this diff, suggesting preparatory work for future integration.

app/Filament/Resources/SaleResource/Pages/CreateSale.php

@@ -5,12 +5,15 @@ namespace App\Filament\Resources\SaleResource\Pages;
 use App\Actions\Sales\CreateSaleAction;
 use App\Actions\Sales\SyncAccountsAction;
 use App\Actions\Transactions\CreateRecordTransactionsAction;
+use App\Commands\Clients\GenerateBaseAccountCommand;
 use App\Filament\Resources\ClientResource;
 use App\Filament\Resources\SaleResource;
 use App\Models\Branch;
 use App\Models\Client;
 use App\Models\Sale;
 use App\Services\Sales\SaleService;
+use Filament\Actions\Action;
+use Filament\Forms\Components\Actions;
 use Filament\Resources\Pages\CreateRecord;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Support\Arr;