Add PUT /api/v2/licenses/[licenseKey]/system-name (200/400 invalid_name/
404 unknown_license/409 name_taken, idempotent) and extend POST
/api/v2/license with an optional systemName and additive systemNameStatus
(ok/unchanged/conflict/invalid). Validation always succeeds; an omitted
field never changes or clears a name and empty/whitespace is invalid.
Adds server and helper tests covering trimming, bounds, case-insensitive
uniqueness, cross-account reuse, 404, and idempotency.
