feat(services): pick a global category from the service page

The service page could not say which category a service belongs to, so the
containment edges defined in settings had nothing to match against.

A Categories tab now selects one — and only selects. Creating, renaming and
deleting stay in Settings > Categories: if every page could create one,
"whole body" would exist three times with three spellings and the
includes edge would stop catching anything.

PATCH /api/v1/service-item/{uuid} carries the choice as
catalog_category_uuid. Absent field leaves the current category alone, null
clears it, and a category from another environment is refused with 422 —
the uuid arrives in the request body where TenantFilter does not reach.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

assets/admin/pages/ServiceDetailPage.tsx

@@ -20,6 +20,7 @@ import ServiceInsuranceModal from '../components/ServiceInsuranceModal';
 import ServiceItemFormModal from '../components/ServiceItemFormModal';
 import ServiceGroupsTab from '../components/ServiceGroupsTab';
 import ServiceSegmentsTab from '../components/ServiceSegmentsTab';
+import ServiceCategoryTab from '../components/ServiceCategoryTab';
 
 interface Tariff {
   uuid: string;
@@ -55,6 +56,7 @@ const TABS = [
   { id: 'insurance', label: 'بیمه‌ها' },
   { id: 'groups',    label: 'گروه‌ها و آیتم‌ها' },
   { id: 'segments',  label: 'بخش‌های نوبت' },
+  { id: 'categories',label: 'دسته‌بندی‌ها' },
   { id: 'goods',     label: 'کالاهای مرتبط' },
   { id: 'history',   label: 'لاگ تغییرات' },
 ] as const;
@@ -543,6 +545,13 @@ function ServiceDetailPageInner() {
       {tab === 'insurance' && <InsuranceTab item={item} onManage={() => setInsuranceOpen(true)} canUpdate={canUpdate} />}
       {tab === 'groups'    && <ServiceGroupsTab serviceUuid={item.uuid} canEdit={canUpdate} />}
       {tab === 'segments'  && <ServiceSegmentsTab serviceUuid={item.uuid} canEdit={canUpdate} />}
+      {tab === 'categories' && (
+        <ServiceCategoryTab
+          serviceUuid={item.uuid}
+          categoryUuid={item.catalog_category_uuid ?? null}
+          canEdit={canUpdate}
+        />
+      )}
       {tab === 'goods'     && <GoodsTab item={item} onEdit={() => setEditOpen(true)} canUpdate={canUpdate} />}
       {tab === 'history'   && <HistoryTab item={item} />}