fix(dto): align daily_login_bonus DTOs with prod wire shape

- numeric fields ship as quoted strings (campaign_id, img, effect_id,
  reward_type, reward_detail_id, reward_number)
- DailyLoginBonus.Campaign is a List<>, not a single object
- LoginBonusCampaign.Img replaces Image (string, asset-key)
- add IsOneDayMultiRewards (SpecialData-only on client, byte-faithful)

SVSim.EmulatedEntrypoint/Models/Dtos/Responses/IndexResponse.cs

@@ -149,8 +149,10 @@ public class IndexResponse
     public List<UserRankedMatches> UserRankedMatches { get; set; } = new();
 
     /// <summary>
-    /// Spec: optional. Shape is {normal?, total?, campaign?[]} per common/types.ts.md DailyLoginBonus.
-    /// Populated by ILoginBonusService when the viewer has an active bonus period; null otherwise.
+    /// Spec: optional. Shape {normal?, total?, campaign?[]} — client parses three keys
+    /// in LoadDetail.cs:553. <c>normal</c> presence triggers the login-bonus popup
+    /// (NextSceneSwitcher.cs:103). Populated by ILoginBonusService at /load/index time;
+    /// null when the viewer has already claimed today's bonus.
     /// </summary>
     [JsonPropertyName("daily_login_bonus")]
     [Key("daily_login_bonus")]