Removed RewardGrantService, CurrencySpendService, ICurrencySpendService,
ViewerEntitlements, IViewerEntitlements, CardAcquisitionService,
ICardAcquisitionService, CardGrantResult and their tests
(RewardGrantServiceTests, CurrencySpendServiceTests,
CardAcquisitionServiceTests, ViewerEntitlementsTests). Removed four DI
registrations from Program.cs. No caller references any deleted type;
GrantedReward and EffectiveCosmetics were pre-moved to InventoryGrantTypes.cs
in the prior commit. Build clean, 712/712 tests pass.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>