Implement assign-owner / revoke-owner in system admin resources HEAD main

The system-administrator role carries system:resource:assign-owner
(migration 20250729_02), but no endpoint used it.  Sysadmins had no API
path to bootstrap ownership on a resource that has no owner yet.

Implement two endpoints in gn_auth/auth/system/admin/resources.py
(the blueprint skeleton was already wired in a preceding commit):

  POST /auth/system/administration/resources/<resource_id>/assign-owner
    Body: {"user_id": "<uuid>"}
    Assigns the resource-owner role to the named user on the resource.

  POST /auth/system/administration/resources/<resource_id>/revoke-owner
    Body: {"user_id": "<uuid>"}
    Revokes the resource-owner role from the named user on the resource.

Both check system:resource:assign-owner on the *system* resource, so a
sysadmin can grant/revoke ownership without being resource-owner
themselves.

Reviewed-By: Frederick M. Muriithi <fredmanglis@gmail.com>

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