gamer147 90d420d97a feat(calendar): add IGameCalendarService — UTC reset-boundary primitive ...

New config-driven service that replaces JstPeriod. All timestamps are UTC;
one config value (GameCalendarConfig.DailyResetUtcHour, default 0 = midnight
UTC) drives both ResetReady checks and DayKey/WeekKey/MonthKey bucket keys.
Because both derive from the same MostRecentBoundary helper, they can never
disagree.

Prod parity is a config flip: set DailyResetUtcHour=17 in GameConfigs to get
the 02:00 JST boundary. No JST-flavored math anywhere in the code.

JstPeriod callsite migration + deletion follow in subsequent commits.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

2026-07-04 11:46:12 -04:00

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