feat(5.22): Saved Searches / Smart Lists — reusable filters for list views

- SavedFilter model with TenantMixin (name, entity_type, filter_criteria JSONB, user_id)
- Routes: GET/POST /saved-filters, DELETE /saved-filters/{id} with RBAC
- Alembic migration 0029_saved_filters creates saved_filters table
- Frontend: SavedFilters.tsx component with save/load/delete UI
- Frontend: api/savedFilters.ts with React Query hooks
- Integrated into ContactsListPage as example
- i18n keys for savedFilters.* in de.json and en.json
- Tests: test_saved_filters.py (9 tests) + SavedFilters.test.tsx (3 tests)
- Registered SavedFilter in conftest.py

tests/conftest.py

@@ -82,6 +82,7 @@ from app.plugins.builtins.report_generator.models import (  # noqa: F401
 from app.plugins.builtins.tags.models import Tag, TagAssignment  # noqa: F401
 from app.plugins.builtins.tasks import TasksPlugin  # noqa: F401
 from app.plugins.builtins.tasks.models import Task  # noqa: F401
+from app.models.saved_filter import SavedFilter  # noqa: F401
 from app.plugins.registry import reset_registry_for_testing  # noqa: F401
 from app.services.plugin_service import reset_plugin_service_for_testing  # noqa: F401