post
https://api.qfp.quantnetwork.net/api/tenants//roles
Defines a role owned by the caller's own tenant, granting the named
permissions. Requires role:create, and the path tenant must equal
the caller's tenant_id claim. A caller may not grant a permission
they do not hold themselves; the names to pick from are the catalog
at GET /api/permissions.
The trimmed name must be free: a platform role name or one already
used by this tenant is 409, compared case-insensitively. Returns
200, not 201.

