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/models/person/columns.yaml

@@ -0,0 +1,7 @@
+columns:
+    name:
+        label: acme.roster::lang.people.name
+        searchable: true
+    email:
+        label: acme.roster::lang.people.email
+        searchable: true

modules/cabana/testdata/roster/models/person/fields.yaml

@@ -0,0 +1,9 @@
+fields:
+    name:
+        label: acme.roster::lang.people.name
+        type: text
+        span: left
+    email:
+        label: acme.roster::lang.people.email
+        type: text
+        span: right