fix: align service channel publish snapshot JSON with preview API

Co-authored-by: Cursor <cursoragent@cursor.com>

src/Oms.Application/Services/Channels/ServiceChannelService.Helpers.cs

@@ -246,7 +246,7 @@ public partial class ServiceChannelService
             PublishUser = string.IsNullOrWhiteSpace(CurrentUser.UserName) ? CurrentUser.GetId<int>().ToString() : CurrentUser.UserName!,
             PublishTime = DateTime.Now,
             Description = description,
-            Content = OmsDocHelper.SerializeJson(snapshot)
+            Content = OmsDocHelper.SerializeSnapshotJson(snapshot)
         });
     }
 

src/Oms.Application/Shared/OmsDocHelper.cs

@@ -20,6 +20,7 @@ public static class OmsDocHelper
     private static readonly JsonSerializerOptions SnapshotJsonOptions = new()
     {
         PropertyNameCaseInsensitive = true,
+        PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
         DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull
     };