Drop companyId from company-scoped store wrappers and routes, add GET /entity/next-number plus optional number on entity create/update, and document dashdbschema API.md lookup in sibling-repos.
Wires up the existing category.move store method (validates source and
target in the same company, rejects self/descendant cycles, assigns the
next sibling sort) behind an authenticated HTTP route, plus @openapi
docs and regenerated API docs.
Wires up existing category.order store method (validates categoryIds are
exactly the current children of parentId, sets each child sort to its
index in one transaction) behind an authenticated HTTP route, plus
@openapi docs and regenerated API docs.
