feat: establish reservation portal foundation

app/Domain/Reservations/Models/ReservationItem.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace App\Domain\Reservations\Models;
+
+use App\Domain\Inventory\Models\SnipeAsset;
+use App\Domain\Reservations\Enums\ReservationItemStatus;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class ReservationItem extends Model
+{
+    protected $fillable = [
+        'reservation_id', 'snipe_asset_id', 'starts_at', 'ends_at', 'status',
+        'delivered_at', 'returned_at', 'checkout_reference', 'checkin_reference',
+        'condition_out', 'condition_in', 'notes',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'status' => ReservationItemStatus::class,
+            'starts_at' => 'immutable_datetime',
+            'ends_at' => 'immutable_datetime',
+            'delivered_at' => 'immutable_datetime',
+            'returned_at' => 'immutable_datetime',
+        ];
+    }
+
+    /** @return BelongsTo<Reservation, $this> */
+    public function reservation(): BelongsTo
+    {
+        return $this->belongsTo(Reservation::class);
+    }
+
+    /** @return BelongsTo<SnipeAsset, $this> */
+    public function asset(): BelongsTo
+    {
+        return $this->belongsTo(SnipeAsset::class, 'snipe_asset_id');
+    }
+}