feat(ticket): implement DesfileEntryReservationController and related services for ticket reservations

app/Domains/Ticketing/Ticket/Services/EntryReservationPolicy.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Domains\Ticketing\Ticket\Services;
+
+use App\Domains\Commerce\Catalog\Models\CatalogItem;
+use App\Domains\Commerce\Catalog\Models\Inventory;
+use App\Domains\Commerce\Catalog\Models\Variant;
+use Illuminate\Validation\ValidationException;
+
+interface EntryReservationPolicy
+{
+    /**
+     * Validate additional rules after selections are resolved and locked, before
+     * stock or tickets change. Idempotent replays do not run this validation.
+     *
+     * @param  array<int, array{item: CatalogItem, variant: Variant|null, inventory: Inventory|null}>  $selections
+     *
+     * @throws ValidationException
+     */
+    public function validate(array $selections): void;
+}