feat(central-ui): FlowDebugService — management-command bridge + predicted graph

IFlowDebugService/FlowDebugService (scoped, registered beside IDataConnectionMoveService).
Run/replay go to the per-node ManagementActor through ManagementActorHolder with the Blazor
principal projected to AuthenticatedUser, exactly as DataConnectionMoveService does; the
FlowDebugRunResult payload is deserialised (camelCase) and fed to FlowGraphBuilder, while
ManagementError/Unauthorized/holder-null/transport faults collapse into FlowDebugOutcome
with the server's error code verbatim (STANDBY_NODE reaches the page untouched). Prediction
is DB-only: PredictMethodAsync hands FlowShapePredictor a memoised resolver that maps a
route target → Instance.UniqueName → template parent chain (nearest definition wins, cycle
guarded) → TemplateScript.Code; PredictValueChangeAsync roots at the write and appends each
script whose value-change trigger names the attribute (same attributeName/attribute keys
the site's TriggerRouting parser reads).

Claude-Session: https://claude.ai/code/session_01GSLkkHKz9JrAtmJjmQK3cP

src/ZB.MOM.WW.ScadaBridge.CentralUI/ServiceCollectionExtensions.cs

@@ -140,6 +140,7 @@ public static class ServiceCollectionExtensions
         // name collision, no instance binding, no native-alarm-source name reference);
         // the move dialog only SUBMITS the command and renders the returned outcome.
         services.AddScoped<IDataConnectionMoveService, DataConnectionMoveService>();
+        services.AddScoped<IFlowDebugService, FlowDebugService>();
 
         // Schema Library: authoring + read accessors for the reusable named
         // JSON-Schema library (SharedSchema + ISharedSchemaRepository).