feat(viewer): add LastLoginBonusClaimedAt + LoginBonusStreak columns

Drops the unused daily_login_bonuses table in the same migration.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

SVSim.Database/Models/Viewer.cs

@@ -33,6 +33,18 @@ public class Viewer : BaseEntity<long>
     
     public DateTime LastLogin { get; set; }
 
+    /// <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.
+    /// </summary>
+    public DateTime? LastLoginBonusClaimedAt { get; set; }
+
+    /// <summary>
+    /// 1-based position in the Normal login-bonus cycle. 0 = never claimed (first claim
+    /// will write 1). Wraps back to 1 after reaching cycle length (LoginBonusConfig.Normal.Count).
+    /// </summary>
+    public int LoginBonusStreak { get; set; }
+
     /// <summary>BGType enum: 0=Deck, 1=CustomBG, 2=RandomBG. Default 0 = follow equipped deck's leader skin.</summary>
     public int MyPageBgSelectType { get; set; }