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.EmulatedEntrypoint/Controllers/LoadController.cs

@@ -229,10 +229,8 @@ public class LoadController : SVSimController
             MaintenanceCards = (await _globalsRepository.GetMaintenanceCards())
                 .Select(e => e.Id).ToList(),
             RedEtherOverrides = new List<RedEtherOverride>(),
-            // Optional per spec (load-index.md:247). Skeleton-seeded rows in DailyLoginBonuses table
-            // capture prod's empty-period shape ({"1":[], "3":[], "4":[]}); the spec-shaped DTO
-            // ({normal?, total?, campaign?[]}) carries nothing meaningful until an active campaign
-            // is captured.
+            // Optional per spec (load-index.md:247). Populated by ILoginBonusService (Task 6)
+            // when the viewer has an active bonus period.
             DailyLoginBonus = null,
             UserRankedMatches = new List<UserRankedMatches>(),
             UserRankInfo = RankFormats.Select(f => new UserRankInfo