feat(resource): expose each offering's service section

The resource booking modal groups services under their section, the way the
doctor's service booking does. The offering list had no section, so the list
could only be flat.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/Resource/Service/ResourceServiceAssignmentService.php

@@ -47,6 +47,12 @@ final class ResourceServiceAssignmentService
                 'effective_price_rials'      => $spec->priceRials,
                 'duration_source'            => $spec->durationSource,
                 'price_source'               => $spec->priceSource,
+                // مودالِ رزرو منبع سرویس‌ها را زیر بخششان گروه می‌کند؛ بدون این، فهرست
+                // یک لیست تختِ بی‌دسته می‌شد.
+                'service_section'            => [
+                    'uuid' => $item->getSection()->getUuid(),
+                    'name' => $item->getSection()->getName(),
+                ],
             ];
         }