Add REST API for managing license packages and keys:
- GET/POST /api/v1/repos/{owner}/{repo}/license-packages
- GET/POST /api/v1/repos/{owner}/{repo}/license-keys
- DELETE /api/v1/repos/{owner}/{repo}/license-keys/{id}
- GET /api/v1/repos/{owner}/{repo}/license-keys/{id}/usage
API structs for create/edit/response, with raw key only returned on
creation. Requires repo admin permissions.
Ref #239
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>