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/app/Models/Cliente.php

@@ -14,6 +14,7 @@ class Cliente extends Model
 
     protected $fillable = [
         'username', 'password',
+        'sconti_abilitati', 'sconto_max_1', 'sconto_max_2',
         'nome', 'cognome', 'ragione_sociale', 'email', 'telefono',
         'indirizzo', 'cap', 'citta', 'provincia', 'note',
     ];
@@ -24,8 +25,29 @@ class Cliente extends Model
 
     protected $casts = [
         'password' => 'hashed',
+        'sconti_abilitati' => 'boolean',
+        'sconto_max_1' => 'decimal:2',
+        'sconto_max_2' => 'decimal:2',
     ];
 
+    /**
+     * Sconti massimi (%) che il cliente può applicare al preventivo: i suoi, se personalizzati,
+     * altrimenti la regola base. Zero per entrambi se l'amministratore li ha disabilitati.
+     *
+     * @return array{max_1:float,max_2:float}
+     */
+    public function scontiMassimi(): array
+    {
+        if (! $this->sconti_abilitati) {
+            return ['max_1' => 0.0, 'max_2' => 0.0];
+        }
+
+        return [
+            'max_1' => (float) ($this->sconto_max_1 ?? Impostazione::scontiBase()['max_1']),
+            'max_2' => (float) ($this->sconto_max_2 ?? Impostazione::scontiBase()['max_2']),
+        ];
+    }
+
     public function preventivi(): HasMany
     {
         return $this->hasMany(Preventivo::class);