Stacks a second [HttpPost("/tutorial/pack_info")] absolute route on
PackController.Info so the tutorial flow resolves to the same action
and returns the same pack_config_list as /pack/info (no filtering in v1).
Adds PackControllerTests.cs with TutorialPackInfo_returns_same_list_as_pack_info
verifying byte-identical responses from both URLs.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>