feat: establish reservation portal foundation

app/Domain/Reservations/Models/Reservation.php

@@ -0,0 +1,53 @@
+<?php
+
+namespace App\Domain\Reservations\Models;
+
+use App\Domain\Reservations\Enums\ReservationStatus;
+use App\Models\User;
+use Illuminate\Database\Eloquent\Concerns\HasUuids;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class Reservation extends Model
+{
+    use HasUuids;
+
+    protected $fillable = [
+        'uuid', 'reference', 'requester_id', 'purpose', 'usage_location', 'starts_at',
+        'ends_at', 'status', 'approval_deadline', 'approved_by', 'approved_at',
+        'rejected_by', 'rejected_at', 'decision_reason', 'cancelled_by',
+        'cancelled_at', 'cancellation_reason',
+    ];
+
+    /** @return list<string> */
+    public function uniqueIds(): array
+    {
+        return ['uuid'];
+    }
+
+    protected function casts(): array
+    {
+        return [
+            'status' => ReservationStatus::class,
+            'starts_at' => 'immutable_datetime',
+            'ends_at' => 'immutable_datetime',
+            'approval_deadline' => 'immutable_datetime',
+            'approved_at' => 'immutable_datetime',
+            'rejected_at' => 'immutable_datetime',
+            'cancelled_at' => 'immutable_datetime',
+        ];
+    }
+
+    /** @return BelongsTo<User, $this> */
+    public function requester(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'requester_id');
+    }
+
+    /** @return HasMany<ReservationItem, $this> */
+    public function items(): HasMany
+    {
+        return $this->hasMany(ReservationItem::class);
+    }
+}