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/testdata/roster/controllers/people/config_form.yaml

@@ -0,0 +1,10 @@
+name: acme.roster::lang.people.form
+form: ~/plugins/acme/roster/models/person/fields.yaml
+modelClass: Person
+defaultRedirect: acme/roster/people
+create:
+    redirect: acme/roster/people/update/:id
+    redirectClose: acme/roster/people
+update:
+    redirect: acme/roster/people
+    redirectClose: acme/roster/people

modules/cabana/testdata/roster/controllers/people/config_list.yaml

@@ -0,0 +1,13 @@
+list: ~/plugins/acme/roster/models/person/columns.yaml
+modelClass: Person
+title: acme.roster::lang.people.title
+recordUrl: acme/roster/people/update/:id
+recordsPerPage: 20
+showCheckboxes: true
+toolbar:
+    buttons: [create, delete]
+    search:
+        prompt: backend::lang.list.search_prompt
+bulkActions: [activate, archive]
+messages:
+    create: acme.roster::lang.people.create