CHW-4820 PackagesPathInvalid

packages API path is invalid; expected /api/repos/{repository}/packages/{package...}

Default message: packages API path is invalid; expected /api/repos/{repository}/packages/{package…}
HTTP status: 400 (client)

Problem. The packages sub-route did not see the expected shape. Cause. Expected /api/repos/{repo}/packages/{package...}; the second segment was not packages. Fix. Use the canonical shape. HTTP 400.