Unify list plugins, add solution list and per-story detail page

- vitec_usecaselist: layout + record selection like marketlist
- new plugin vitec_solutionlist (spec 7.13.3, key "solutions")
- tx_vitec_domain_model_usecase: detail_page -> resolved detailUrl
  (also gives story cards in vitec_modelcard a link for the first time)
- "Show Toolbar" checkbox on product/market/solution/usecase lists
- spec bumped to v1.9

BREAKING: vitec_productlist and vitec_usecaselist now emit an object
instead of a bare array. Consumers must read products.products and
usecases.usecases. Also found: productlist had a configurable layout
that was never serialised; it is emitted now, but keeps its own 0-3
vocabulary instead of grid/list/carousel.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

packages/vitec/ext_tables.sql

@@ -95,6 +95,7 @@ CREATE TABLE tx_vitec_product_related_mm (
 CREATE TABLE tx_vitec_domain_model_usecase (
     title varchar(255) DEFAULT '' NOT NULL,
     slug varchar(255) DEFAULT '' NOT NULL,
+    detail_page int(11) DEFAULT '0' NOT NULL,
     subtitle varchar(255) DEFAULT '' NOT NULL,
 
     card_image int(11) unsigned DEFAULT '0' NOT NULL,