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/src/Http/Resources/BookingResource.php

@@ -0,0 +1,59 @@
+<?php
+
+namespace Modules\Booking\Http\Resources;
+
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\JsonResource;
+
+class BookingResource extends JsonResource
+{
+    /**
+     * Transform the resource into an array.
+     *
+     * @return array<string, mixed>
+     */
+    public function toArray(Request $request): array
+    {
+        return [
+            'id' => $this->id,
+            'booking_ref' => $this->booking_ref,
+            'status' => $this->status,
+            'travel_date' => $this->travel_date?->toDateString(),
+            'is_round_trip' => $this->is_round_trip,
+            'return_travel_date' => $this->return_travel_date?->toDateString(),
+            'passenger_name' => $this->passenger_name,
+            'passenger_phone' => $this->passenger_phone,
+            'pickup_address' => $this->pickup_address,
+            'pickup_lat' => $this->pickup_lat,
+            'pickup_lng' => $this->pickup_lng,
+            'dropoff_address' => $this->dropoff_address,
+            'dropoff_lat' => $this->dropoff_lat,
+            'dropoff_lng' => $this->dropoff_lng,
+            'price' => $this->price,
+            'created_by_channel' => $this->created_by_channel,
+            // Only ever populated once status is confirmed — see AssignDriverAction.
+            'driver_name' => $this->driver_name,
+            'driver_phone' => $this->driver_phone,
+            'car_plate_number' => $this->car_plate_number,
+            'car_model' => $this->car_model,
+            'vehicle_options' => $this->whenLoaded('vehicleOptions', fn () => $this->vehicleOptions->map(fn ($selection) => [
+                'vehicle_option' => $selection->vehicle_option,
+                'passenger_count' => $selection->passenger_count,
+                'unit_price' => $selection->unit_price,
+                'line_total' => $selection->line_total,
+            ])),
+            'route' => $this->whenLoaded('route', fn () => [
+                'id' => $this->route->id,
+                'ev_company_id' => $this->route->ev_company_id,
+                'from_destination_id' => $this->route->from_destination_id,
+                'to_destination_id' => $this->route->to_destination_id,
+            ]),
+            'time_slot' => $this->whenLoaded('timeSlot', fn () => [
+                'id' => $this->timeSlot->id,
+                'label' => $this->timeSlot->label,
+                'time' => $this->timeSlot->time?->format('H:i'),
+            ]),
+            'created_at' => $this->created_at,
+        ];
+    }
+}