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/ClientResource/RelationManagers/AccountsRelationManager.php

@@ -2,6 +2,7 @@
 
 namespace App\Filament\Resources\ClientResource\RelationManagers;
 
+use App\Commands\Clients\GenerateBaseAccountCommand;
 use App\Filament\Exports\ClientAccountsExporter;
 use App\Models\Account;
 use Filament\Actions\Exports\Enums\ExportFormat;
@@ -43,6 +44,20 @@ class AccountsRelationManager extends RelationManager
                 //
             ])
             ->headerActions([
+                 Tables\Actions\Action::make('generate-base-accounts')
+                 ->requiresConfirmation()
+                 ->label('Generate Base Accounts')
+                 ->action(function () {
+                    $client = $this->getOwnerRecord();
+                    if (! $client ) {
+                        return;
+                    }
+
+                    if($client->accounts()->count() > 0) {
+                        return;
+                    }
+                    app(GenerateBaseAccountCommand::class)->execute($client);
+                }),
                 Tables\Actions\ExportAction::make('Export Accounts')->exporter(ClientAccountsExporter::class)->formats([ExportFormat::Csv]),
                 Tables\Actions\CreateAction::make()->label('New Account')->icon('heroicon-o-plus')->slideOver(),
             ])