refactor(calendar): delete JstPeriod, update doc comments

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>

SVSim.Database/Models/Viewer.cs

@@ -35,7 +35,7 @@ public class Viewer : BaseEntity<long>
 
     /// <summary>
     /// UTC instant of the most recent daily-login-bonus claim. Null = never claimed.
-    /// Compared against JST 02:00 day boundary via JstPeriod.DayKey to decide eligibility.
+    /// Compared against the daily reset boundary via IGameCalendarService.ResetReady.
     /// </summary>
     public DateTime? LastLoginBonusClaimedAt { get; set; }
 

SVSim.Database/Models/ViewerEventCounter.cs

@@ -3,7 +3,8 @@ namespace SVSim.Database.Models;
 /// <summary>
 /// Per-viewer "how many times has this happened" counter. Composite PK
 /// (ViewerId, EventKey, Period). Period strings: "all-time", "month:YYYY-MM",
-/// "week:YYYY-W##", "day:YYYY-MM-DD" — all JST-anchored with 02:00 day-boundary.
+/// "week:YYYY-W##", "day:YYYY-MM-DD" — all UTC, with the reset-window boundary
+/// set by <c>GameCalendarConfig.DailyResetUtcHour</c>.
 /// Single source of truth for total_count / done_number on every wire shape.
 /// </summary>
 public class ViewerEventCounter

SVSim.EmulatedEntrypoint/Services/JstPeriod.cs

@@ -1,53 +0,0 @@
-using System.Globalization;
-
-namespace SVSim.EmulatedEntrypoint.Services;
-
-/// <summary>
-/// JST-anchored period bucketing for ViewerEventCounters. Day/week/month boundaries are
-/// 02:00 JST (matching the real-game daily reset). Pure functions, no dependencies.
-/// </summary>
-public static class JstPeriod
-{
-    private static readonly TimeSpan Jst = TimeSpan.FromHours(9);
-    private const string DayPrefix   = "day:";
-    private const string WeekPrefix  = "week:";
-    private const string MonthPrefix = "month:";
-    public const string AllTime = "all-time";
-
-    /// <summary>
-    /// Converts the given instant to a JST-anchored "effective date" by:
-    /// 1. Shifting to JST (+09:00)
-    /// 2. Subtracting 2 hours so anything before 02:00 JST belongs to the previous day
-    /// </summary>
-    private static DateTime EffectiveJstDate(DateTimeOffset utcOrAny)
-    {
-        var jst = utcOrAny.ToOffset(Jst);
-        return jst.AddHours(-2).Date;
-    }
-
-    public static string DayKey(DateTimeOffset when)
-    {
-        var d = EffectiveJstDate(when);
-        return $"{DayPrefix}{d:yyyy-MM-dd}";
-    }
-
-    public static string WeekKey(DateTimeOffset when)
-    {
-        var d = EffectiveJstDate(when);
-        var iso = ISOWeek.GetWeekOfYear(d);
-        var year = ISOWeek.GetYear(d);
-        return $"{WeekPrefix}{year:D4}-W{iso:D2}";
-    }
-
-    public static string MonthKey(DateTimeOffset when)
-    {
-        var d = EffectiveJstDate(when);
-        return $"{MonthPrefix}{d:yyyy-MM}";
-    }
-
-    /// <summary>Returns [day, week, month, all-time] keys for the given instant.</summary>
-    public static IReadOnlyList<string> AllPeriods(DateTimeOffset when) => new[]
-    {
-        DayKey(when), WeekKey(when), MonthKey(when), AllTime,
-    };
-}

SVSim.UnitTests/Models/GameConfigurationJsonbTests.cs

@@ -34,7 +34,7 @@ public class GameConfigurationJsonbTests
             "Player", "DefaultGrants", "DefaultLoadout", "Challenge", "Rotation", "PackRates",
             "MyRotationSchedule", "Story", "ResourceConfig", "Freeplay", "ArenaTwoPick", "Matching",
             "CardMasterConfig", "ColosseumSeason", "ColosseumRounds", "LoginBonus", "Guild",
-            "SkipTutorial", "BattleXp",
+            "SkipTutorial", "BattleXp", "GameCalendar",
         }));
 
         var resources = JsonSerializer.Deserialize<ResourceConfig>(byName["ResourceConfig"].ValueJson)!;

SVSim.UnitTests/Services/JstPeriodTests.cs

@@ -1,52 +0,0 @@
-namespace SVSim.UnitTests.Services;
-
-public class JstPeriodTests
-{
-    private static DateTimeOffset Jst(int y, int m, int d, int h, int min, int s) =>
-        new DateTimeOffset(y, m, d, h, min, s, TimeSpan.FromHours(9));
-
-    [Test]
-    public void DayKey_uses_jst_with_02_00_anchor()
-    {
-        // 01:59:59 JST on May 27 belongs to the May 26 "day".
-        Assert.That(SVSim.EmulatedEntrypoint.Services.JstPeriod.DayKey(Jst(2026, 5, 27, 1, 59, 59)),
-            Is.EqualTo("day:2026-05-26"));
-
-        // 02:00:00 JST on May 27 belongs to the May 27 "day".
-        Assert.That(SVSim.EmulatedEntrypoint.Services.JstPeriod.DayKey(Jst(2026, 5, 27, 2, 0, 0)),
-            Is.EqualTo("day:2026-05-27"));
-    }
-
-    [Test]
-    public void WeekKey_is_iso8601_monday_anchored()
-    {
-        // 2026-05-25 (Monday) 02:00 JST → ISO week 2026-W22.
-        Assert.That(SVSim.EmulatedEntrypoint.Services.JstPeriod.WeekKey(Jst(2026, 5, 25, 2, 0, 0)),
-            Is.EqualTo("week:2026-W22"));
-
-        // The previous Sunday's late evening still belongs to W21 (week reset is Monday 02:00 JST).
-        Assert.That(SVSim.EmulatedEntrypoint.Services.JstPeriod.WeekKey(Jst(2026, 5, 25, 1, 59, 59)),
-            Is.EqualTo("week:2026-W21"));
-    }
-
-    [Test]
-    public void MonthKey_uses_jst_day_anchor_for_month_rollover()
-    {
-        // 01:59 JST on June 1 still belongs to May (day-boundary is 02:00 JST).
-        Assert.That(SVSim.EmulatedEntrypoint.Services.JstPeriod.MonthKey(Jst(2026, 6, 1, 1, 59, 0)),
-            Is.EqualTo("month:2026-05"));
-
-        Assert.That(SVSim.EmulatedEntrypoint.Services.JstPeriod.MonthKey(Jst(2026, 6, 1, 2, 0, 0)),
-            Is.EqualTo("month:2026-06"));
-    }
-
-    [Test]
-    public void AllPeriods_returns_day_week_month_all_time()
-    {
-        var t = Jst(2026, 5, 27, 12, 0, 0);
-        var periods = SVSim.EmulatedEntrypoint.Services.JstPeriod.AllPeriods(t);
-        Assert.That(periods, Is.EquivalentTo(new[] {
-            "day:2026-05-27", "week:2026-W22", "month:2026-05", "all-time",
-        }));
-    }
-}