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/phrasebook/backend/lang/en/lang.yaml

@@ -51,6 +51,13 @@ list:
   filter_from: From
   filter_to: To
   pagination: Pagination
+  bulk_actions: Bulk actions
+  bulk_confirm: "Run “:action” on the selected (:count)?"
+  bulk_done:
+    one: "Action completed for :count record."
+    other: "Action completed for :count records."
+  bulk_stale: Some of the selected records are no longer available. The list has been refreshed; select the records again.
+  action_forbidden: You do not have permission to run this action.
 form:
   save: Save
   save_and_close: Save and close