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/filament/pages/scontistica.blade.php

@@ -0,0 +1,9 @@
+<x-filament-panels::page>
+    <x-filament-panels::form wire:submit="save">
+        {{ $this->form }}
+
+        <x-filament-panels::form.actions :actions="[
+            \Filament\Actions\Action::make('save')->label('Salva')->submit('save'),
+        ]" />
+    </x-filament-panels::form>
+</x-filament-panels::page>