Mirror the lens make/model editing surface for cameras: entity UpdateMakeModel/SaveForm, form validation, query, search, the GET/PUT /api/v1/cameras endpoints, and the cameras CLI command, plus a cameras ACL resource and scope.
Also tidy the lens surface for parity: self-validating SaveForm, empty make/model guard, X-Count search header, service-role grant, the empty-id/slug docs, and order cameras before lenses everywhere.
