fix: 买价发布落库也走 canonical JSON，与同步态对比一致

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

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

@@ -337,7 +337,11 @@ public partial class ServiceChannelService
             ? await BuildPricePublishSnapshotAsync(serviceChannelId)
             : await BuildRulesPublishSnapshotAsync(serviceChannelId);
 
-        // Content 中保存完整快照，回滚时直接从快照恢复。
+        var content = operatorType == PriceOperatorType
+            ? OmsDocHelper.CanonicalizeChannelPriceSnapshotJson(snapshot)
+            : OmsDocHelper.SerializeSnapshotJson(snapshot);
+
+        // Content 存 canonical 形态，与 sync-status 对比口径一致。
         await ServiceChannelRepository.InsertPublishRecordAsync(new ServiceChannelPublishRecord
         {
             ServiceChannelId = serviceChannelId,
@@ -347,7 +351,7 @@ public partial class ServiceChannelService
             PublishUser = string.IsNullOrWhiteSpace(CurrentUser.UserName) ? CurrentUser.GetId<int>().ToString() : CurrentUser.UserName!,
             PublishTime = DateTime.Now,
             Description = description,
-            Content = OmsDocHelper.SerializeSnapshotJson(snapshot)
+            Content = content
         });
     }