All JstPeriod callsites have moved to IGameCalendarService — delete the static class and its tests. Updates the doc comments on Viewer.cs (LastLoginBonusClaimedAt) and ViewerEventCounter.cs to reference the new UTC / config-driven boundary instead of the old "JST 02:00". GameConfigurationJsonb config-section snapshot test picks up "GameCalendar". Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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632 B