feat: ILoginBonusService — JST day-bucketed claim + grant + DTO assembly

GrantIfDueAsync advances streak (1..15 cycle), grants the day's reward via
inventory tx, returns wire-shape DailyLoginBonus. IsDue helper for MyPage.

Also fixes GameConfigurationJsonbTests section-count (15→16) which was broken
since Task 3 added the LoginBonus [ConfigSection] but the assertion wasn't updated.

SVSim.EmulatedEntrypoint/Program.cs

@@ -113,6 +113,7 @@ public class Program
         builder.Services.AddScoped<IArenaTwoPickService, ArenaTwoPickService>();
         builder.Services.AddScoped<IMatchContextBuilder, MatchContextBuilder>();
         builder.Services.AddScoped<IStoryService, StoryService>();
+        builder.Services.AddScoped<ILoginBonusService, LoginBonusService>();
         builder.Services.AddScoped<IDeckListBuilder, DeckListBuilder>();
         builder.Services.AddSingleton<IRandom, SystemRandom>();
         builder.Services.AddSingleton<PuzzleMissionEvaluator>();