The tutorial alias bypassed the currency / type_detail / open-count guards
unconditionally. Combined with the unconditional TutorialState=100 write, any
authenticated viewer could send /tutorial/pack_open with any parent_gacha_id
to draw a pack for free and clobber their state down to 100.
Two gates: parent_gacha_id MUST be 99047 (the legendary starter), and the
viewer's TutorialState MUST be below 100. The state write is also max-preserved
as a belt-and-braces backstop. Mirrors the 31→41 guard in GiftController.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
82d9668c9b