CHW-4819 APIRouteUnsupported

unsupported API route; see /api/openapi.yaml for the list of supported endpoints

Default message: unsupported API route; see /api/openapi.yaml for the list of supported endpoints
HTTP status: 404 (client)

Problem. /api/repos/{repo}/... request fell through every sub-route. Cause. Only .../vulnerabilities and .../packages/... are implemented under /api/repos/. Fix. Consult /api/openapi.yaml for the supported endpoint set. HTTP 404.