feat: add version activation — choose which version is active

Backend:
- POST /api/tests/{id}/activate — deactivates all versions in chain, activates selected
- GET /api/tests — simplified to is_active=True only (no parent_id subquery)
- GET/PUT /api/tests/{id} — removed is_active filter, any version accessible by id
- PUT /api/tests/{id} — new version auto-activates, parent deactivates

Frontend:
- Version history table: status column (Активная/Неактивная), 'Сделать активной' button

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/api/tests.ts

@@ -70,4 +70,5 @@ export const testsApi = {
   update: (id: number, data: CreateTestDto) =>
     client.put<UpdateTestResponse>(`/tests/${id}`, data),
   versions: (id: number) => client.get<TestListItem[]>(`/tests/${id}/versions`),
+  activate: (id: number) => client.post<Test>(`/tests/${id}/activate`),
 }

frontend/src/pages/TestEdit/index.tsx

@@ -33,6 +33,17 @@ export default function TestEdit() {
     enabled: !editMode,
   })
 
+  const { mutate: activateVersion, isPending: isActivating } = useMutation({
+    mutationFn: (versionId: number) => testsApi.activate(versionId).then((r) => r.data),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['tests'] })
+      queryClient.invalidateQueries({ queryKey: ['tests', id, 'versions'] })
+      queryClient.invalidateQueries({ queryKey: ['tests', id] })
+      message.success('Активная версия изменена')
+    },
+    onError: () => message.error('Не удалось изменить активную версию'),
+  })
+
   const { mutate: updateTest, isPending } = useMutation({
     mutationFn: (data: CreateTestDto) => testsApi.update(Number(id), data).then((r) => r.data),
     onSuccess: (result) => {
@@ -173,13 +184,19 @@ export default function TestEdit() {
                 {
                   title: 'Версия',
                   dataIndex: 'version',
-                  width: 90,
-                  render: (v: number, record: TestListItem) => (
-                    <Space>
-                      <Tag color={record.id === test.id ? 'blue' : 'default'}>v{v}</Tag>
-                      {record.id === test.id && <Text type="secondary">(текущая)</Text>}
-                    </Space>
-                  ),
+                  width: 70,
+                  render: (v: number) => <Tag color="default">v{v}</Tag>,
+                },
+                {
+                  title: 'Статус',
+                  dataIndex: 'is_active',
+                  width: 130,
+                  render: (active: boolean) =>
+                    active ? (
+                      <Tag color="green">Активная</Tag>
+                    ) : (
+                      <Tag color="default">Неактивная</Tag>
+                    ),
                 },
                 {
                   title: 'Дата',
@@ -203,13 +220,25 @@ export default function TestEdit() {
                 {
                   title: '',
                   key: 'action',
-                  width: 100,
-                  render: (_: unknown, record: TestListItem) =>
-                    record.id !== test.id ? (
-                      <Button size="small" onClick={() => navigate(`/tests/${record.id}/edit`)}>
-                        Открыть
-                      </Button>
-                    ) : null,
+                  render: (_: unknown, record: TestListItem) => (
+                    <Space>
+                      {record.id !== test.id && (
+                        <Button size="small" onClick={() => navigate(`/tests/${record.id}/edit`)}>
+                          Открыть
+                        </Button>
+                      )}
+                      {!record.is_active && (
+                        <Button
+                          size="small"
+                          type="primary"
+                          loading={isActivating}
+                          onClick={() => activateVersion(record.id)}
+                        >
+                          Сделать активной
+                        </Button>
+                      )}
+                    </Space>
+                  ),
                 },
               ] as ColumnsType<TestListItem>
             }