backend: require confirmation for signed channel updates [CI]

backend/src/MoShiro.Backend.Application/Agents/ProbeService.cs

@@ -128,6 +128,8 @@ public sealed partial class ProbeService
         }
 
         await _probes.RevokeAsync(id, _time.GetUtcNow().ToUnixTimeMilliseconds(), ct);
+        // 吊销会阻止未来认证；也断开当前直连 Backend 的长会话，不等待 Probe 心跳超时。
+        await _gateway.DisconnectAsync(new NodeId(id), "probe revoked", ct);
         _gateway.NotifyAllTaskSetsChanged();
         return Result<ProbeView>.Ok((await GetAsync(id, ct))!);
     }