PATCH now accepts name (rename, re-slugify) and/or parentId (move under a
new parent, cycle/self guarded), merging both results. Renames the PATCH
docs file to category/update.md and regenerates API docs.
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.
