refactor(driver-pages): address post-review follow-ups

- DriverInstanceSpec carries ClusterId from the deployment artifact;
  DriverHostActor threads the real cluster identity into
  DriverInstanceActor instead of the local NodeId. Old pre-PR
  artifacts without a ClusterId field fall back to the NodeId so
  in-flight deployments keep working.
- DriverHostActor.ChildEntry holds the full DriverInstanceSpec
  (was only carrying DriverType + LastConfigJson). Restart respawns
  preserve RowId, Name, Enabled, ClusterId — no placeholder values.
- Drop the unnecessary _faultLock on DriverInstanceActor — every
  read/write site runs inside an Akka message handler which is
  single-threaded per actor instance.
- DriverStatusPanel.DisposeAsync awaits Timer.DisposeAsync so an
  in-flight 5s tick can't invoke StateHasChanged on a component
  whose hub has already been torn down.

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Components/Shared/Drivers/DriverStatusPanel.razor

@@ -270,10 +270,12 @@
 
     public async ValueTask DisposeAsync()
     {
-        _timer?.Dispose();
+        // Drain the timer first so an in-flight callback can't invoke StateHasChanged on
+        // a component that's already releasing its hub. System.Threading.Timer implements
+        // IAsyncDisposable in .NET 6+; the async dispose awaits any in-flight callback.
+        if (_timer is not null) await _timer.DisposeAsync();
         _opResultClearTimer?.Dispose();
-        if (_hub is not null)
-            await _hub.DisposeAsync();
+        if (_hub is not null) await _hub.DisposeAsync();
     }
 
     // Map DriverState string → chip CSS class using the 4 defined theme variants.