feat(item-purchase): /item_purchase/{info,purchase} + catalog
Schema: ItemPurchaseCatalogEntry (single table). Per-viewer quota tracked
via existing ViewerEventCounter keyed by "item_purchase:<id>" with period
JstPeriod.MonthKey when IsMonthlyReset else AllTime.
Controller:
- /info returns catalog + per-period rest (server-computed
max(0, PurchaseLimit - counter)) + user_card_pack_ticket_list (every
Items.Type==2 row joined to viewer count, zeros included — client
unconditionally UpdateItemNum's each entry).
- /purchase: sold_out check before currency check (no counter increment
on currency failure), inline TryDebit covers RedEther/Crystal/Rupy/Item
with post-state-total reward_list entry, grant via RewardGrantService.
Request `rest` accepted but ignored (server counter is canonical).
Importer mirrors PaymentItemImporter shape — idempotent find-or-create,
seed-missing rows preserved. 3 entries from the prod capture.
486 tests pass (was 476; +10 item_purchase tests).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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