Add Booking module: model, create/read/cancel API, Filament resource (T4.1-T4.7)

- Booking model with booking_vehicle_options line items (supports mixing
  vehicle options like front_seat + back_seat in one booking), price
  snapshot, status machine, and driver/car assignment fields
- BookingService: front-seat max, disabled-option toggles, duplicate-option
  and whole-vehicle-exclusivity guards
- CreateBookingAction, CancelBookingAction, AssignDriverAction
- BookingRefGenerator: sequential EVB-AAAAA1-style refs via row lock
- POST/GET/cancel booking API endpoints (Sanctum, ownership + admin policy)
- BookingPlugin + Filament BookingResource: list, detail view, Cancel and
  Assign Driver actions (shared between table and detail page)
- domain.md updated for multi-vehicle-option bookings (§2) and driver/
  vehicle assignment (§5a)

app-modules/booking/database/factories/BookingVehicleOptionFactory.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace Modules\Booking\Database\Factories;
+
+use Illuminate\Database\Eloquent\Factories\Factory;
+use Modules\Booking\Models\Booking;
+use Modules\Booking\Models\BookingVehicleOption;
+use Modules\Shared\Enums\VehicleOption;
+
+/**
+ * @extends Factory<BookingVehicleOption>
+ */
+class BookingVehicleOptionFactory extends Factory
+{
+    protected $model = BookingVehicleOption::class;
+
+    /**
+     * Define the model's default state.
+     *
+     * @return array<string, mixed>
+     */
+    public function definition(): array
+    {
+        return [
+            'booking_id' => Booking::factory(),
+            'vehicle_option' => VehicleOption::BackSeat,
+            'passenger_count' => 1,
+            'unit_price' => 9000.00,
+            'line_total' => 9000.00,
+        ];
+    }
+}