feat: implement discount and transport features in the quote system

- Added maximum discount settings configurable by the administrator.
- Implemented discount calculations in the quote confirmation process.
- Introduced transport options with associated costs, including handling for exceeding maximum piece limits.
- Updated frontend to display discounts and transport information in the quote summary.
- Created new database migrations for storing discount and transport settings.
- Developed a new Filament page for managing global discount settings.
- Enhanced email templates to include discount and transport details.
- Added tests to ensure proper functionality of discounts and transport calculations.

backoffice/resources/views/emails/preventivo-cliente.blade.php

@@ -16,7 +16,11 @@ indicativo (prezzi IVA esclusa).
 
 Un nostro consulente ti ricontatterà al più presto per finalizzare l'offerta.
 
-**Totale indicativo:** € {{ number_format($preventivo->totale, 2, ',', '.') }}
+**Totale indicativo (IVA esclusa{{ $preventivo->haSconti() ? ', sconti inclusi' : '' }}):** € {{ number_format($preventivo->totale, 2, ',', '.') }}
+@if($preventivo->trasportoDaQuantificare())
+
+{{ $preventivo->notaTrasporto() }}
+@endif
 
 Grazie,<br>
 Il team di Krèios