refactor: drop unused DailyLoginBonuses table + importer

The captured shape ({"1":[], "3":[], "4":[]}) is the empty-period
wire echo; the client parser (LoadDetail.cs:553) only reads normal/total/
campaign. Table, entity, seed, and importer were never wired to a code path.

Replaced by config-section catalog + service in the follow-up commits.

SVSim.Database/Models/DailyLoginBonusEntry.cs

@@ -1,17 +0,0 @@
-using System.ComponentModel.DataAnnotations.Schema;
-using SVSim.Database.Common;
-
-namespace SVSim.Database.Models;
-
-/// <summary>
-/// Daily login bonus campaign from /load/index data.daily_login_bonus (dict keyed by bonus_id,
-/// values are arrays of bonus days). Prod observed keys {1, 3, 4} with empty arrays — recapture
-/// target during active login bonus events.
-/// </summary>
-public class DailyLoginBonusEntry : BaseEntity<int>
-{
-    public int BonusId { get => Id; set => Id = value; }
-
-    [Column(TypeName = "jsonb")]
-    public string BonusData { get; set; } = "[]";
-}