feat: establish reservation portal foundation

tests/Unit/ExampleTest.php

@@ -0,0 +1,5 @@
+<?php
+
+test('that true is true', function () {
+    expect(true)->toBeTrue();
+});

tests/Unit/ReservationStatusTest.php

@@ -0,0 +1,9 @@
+<?php
+
+use App\Domain\Reservations\Enums\ReservationStatus;
+
+it('permite apenas transições de estado explícitas', function () {
+    expect(ReservationStatus::PendingApproval->canTransitionTo(ReservationStatus::Approved))->toBeTrue()
+        ->and(ReservationStatus::PendingApproval->canTransitionTo(ReservationStatus::Delivered))->toBeFalse()
+        ->and(ReservationStatus::Completed->allowedTransitions())->toBeEmpty();
+});