feat(12.1-01): declared bulk actions on admin lists

- pact.HasAdminBulkActions with AdminBulkAction, its input and result
- config_list.yaml bulkActions, compiled fail-loud, needs showCheckboxes
- POST .../{controller}/bulk/{action}: ids resolved and locked through the
  list scope in one transaction; partial selection is 409
- list schema offers declared actions per principal, with confirm text
- admin SPA bulk actions menu with confirm, busy state and failure toasts
- acme.roster fixture, tracer test, OpenAPI, TS types, dist, READMEs, docs

modules/cabana/registry.go

@@ -227,6 +227,11 @@ func compileContributions(reg *Registry, plugins []party.Plugin) error {
 				return err
 			}
 		}
+		for name, action := range controller.BulkActions {
+			if err := reg.validatePermissions("bulk action "+id+"."+name, action.Permissions); err != nil {
+				return err
+			}
+		}
 	}
 	for _, item := range reg.navigation {
 		if err := reg.validateNavigation(item); err != nil {