Add company-scoped brand and company settings API.

brand now carries a NOT NULL company_id (unique per (company_id, name))
with brand.list/upsert/delete backed by resolveCompanyAccess. Adds
companysetting key-value store (list/get/set/delete, frontend flag).

generate-schema-graph.js

@@ -271,6 +271,7 @@ const CLUSTERS = [
       'companyuser',
       'syncpos',
       'company',
+      'companysetting',
       'customergroup',
       'entity',
       'numbers',