feat: groups price calculator admin crud, booking/offer flow and api

src/Service/AccommodationSessionManager.php

@@ -0,0 +1,53 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Service;
+
+use App\Exception\AccommodationSessionNotFoundException;
+use App\Form\Model\AccommodationBookingDto;
+use Symfony\Component\HttpFoundation\Request;
+
+class AccommodationSessionManager
+{
+    // Key kept as accommodation_inquiry for session continuity during the inquiry→booking rename.
+    public const SESSION_KEY = 'accommodation_inquiry';
+
+    public function getDto(Request $request): ?AccommodationBookingDto
+    {
+        $session = $request->getSession();
+
+        if (!$session->has(self::SESSION_KEY)) {
+            return null;
+        }
+
+        $dto = $session->get(self::SESSION_KEY);
+
+        if (!$dto instanceof AccommodationBookingDto) {
+            return null;
+        }
+
+        return $dto;
+    }
+
+    public function getOrFail(Request $request): AccommodationBookingDto
+    {
+        $dto = $this->getDto($request);
+
+        if (null === $dto) {
+            throw new AccommodationSessionNotFoundException();
+        }
+
+        return $dto;
+    }
+
+    public function save(Request $request, AccommodationBookingDto $dto): void
+    {
+        $request->getSession()->set(self::SESSION_KEY, $dto);
+    }
+
+    public function clear(Request $request): void
+    {
+        $request->getSession()->remove(self::SESSION_KEY);
+    }
+}