chore(dto): correct LoginBonusCampaign doc — start/end_date not modeled yet

SVSim.EmulatedEntrypoint/Models/Dtos/LoginBonusCampaign.cs

@@ -7,7 +7,8 @@ namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 /// One login-bonus campaign panel. Used for normal, each campaign array entry, and (when
 /// populated) total. <c>campaign_id</c> and <c>img</c> ship as strings on the wire. Client
 /// consumers: NormalData (reads name, now_count, is_next_reward, reward[]),
-/// SpecialData (also reads start_date, end_date, img, is_one_day_multi_rewards),
+/// SpecialData (also reads img, is_one_day_multi_rewards — start_date/end_date are not
+/// modeled yet and ship absent until a real campaign capture lands),
 /// ContinuousData (reads only reward[]).
 /// </summary>
 [MessagePackObject]