fix(loyalty): correct stamp accumulation, one-per-day guard, and test coverage
- Handler: apply existing redemption BEFORE incrementing stamps (was creating
and applying redemption to same booking)
- Handler: guard stamp increment behind bookingTotal > 0 (free bookings don't
earn stamps)
- Handler: fix global milestone off-by-one (globalCount already includes
current booking since status updated before discount logic)
- Schema: chk_milestone constraint only requires milestone_unit for anniversary
type, not per_user_booking_count or global_booking_count
- Tests: rewrite from scratch with 12 focused tests:
- FullCycle, ExistingRedemptionApplies, OneStampPerDay, ZeroTotalNoStamp,
CycleRepeats, TimeBasedCampaign, PerUserMilestone, GlobalMilestone,
AnniversaryMilestone, LoyaltyPriority, NoDiscountOnZeroTotal,
CampaignMaxRedemptions
- Tests: fix path parameter extraction in makeProgressRequest
- Vendor: go mod tidy + vendor for testify dependency
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