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/admin_openapi.go

@@ -396,6 +396,28 @@ func AdminCreate() {}
 // @Router /{vendor}/{plugin}/{controller}/bulk-delete [post]
 func AdminBulkDelete() {}
 
+// AdminBulkAction documents the declared bulk action route.
+//
+// @Summary Run a declared bulk action
+// @Description Runs a bulk action the controller registers and the list's bulkActions declares. The ids are resolved and row-locked through the controller's list scope in one transaction before the action runs: a selection that matches no scoped row answers affected 0 without running the action, and a partial selection is a 409 that changes nothing.
+// @Tags admin
+// @Accept json
+// @Produce json
+// @Security BackendBearer
+// @Param vendor path string true "Vendor"
+// @Param plugin path string true "Plugin"
+// @Param controller path string true "Controller"
+// @Param action path string true "Bulk action name"
+// @Param body body AdminIDsRequest true "Record ids"
+// @Success 200 {object} Envelope[BulkActionResult]
+// @Failure 401 {object} ErrorEnvelope
+// @Failure 403 {object} ErrorEnvelope
+// @Failure 404 {object} ErrorEnvelope
+// @Failure 409 {object} ErrorEnvelope
+// @Failure 422 {object} ErrorEnvelope
+// @Router /{vendor}/{plugin}/{controller}/bulk/{action} [post]
+func AdminBulkAction() {}
+
 // AdminActionRequest is the body of a widget or toolbar action. record_id is
 // the record a widget on the update form belongs to (absent on create and
 // always absent for a toolbar action); values is the widget's snapshot of its