perf(adminui): drift chip recomposes only when the config-edit watermark moves

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/EndpointRouteBuilderExtensions.cs

@@ -3,12 +3,14 @@ using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Components;
 using Microsoft.AspNetCore.Components.Web;
 using Microsoft.AspNetCore.Routing;
+using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.DependencyInjection.Extensions;
 using Microsoft.Extensions.Logging;
 using ZB.MOM.WW.OtOpcUa.AdminUI.Hubs;
 using ZB.MOM.WW.OtOpcUa.AdminUI.Uns;
 using ZB.MOM.WW.OtOpcUa.Commons.Browsing;
+using ZB.MOM.WW.OtOpcUa.Configuration;
 using ZB.MOM.WW.OtOpcUa.Core.Abstractions;
 using ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Browser;
 using ZB.MOM.WW.OtOpcUa.Driver.Mqtt.Browser;
@@ -103,6 +105,13 @@ public static class EndpointRouteBuilderExtensions
         // TryAdd so a host that already bound a clock (test harness, future fused-host registration) wins.
         services.TryAddSingleton<TimeProvider>(TimeProvider.System);
 
+        // /deployments drift chip. A singleton so its ConfigEdit-watermark cache is shared across
+        // circuits — otherwise every page load would recompose the whole fleet configuration.
+        // Constructed explicitly rather than by ctor scan: the compose seam is an optional parameter
+        // that only tests supply, and production must always get the real ConfigComposer default.
+        services.AddSingleton(sp => new Deployments.DeploymentDriftProbe(
+            sp.GetRequiredService<IDbContextFactory<OtOpcUaConfigDbContext>>()));
+
         // Certificate-store actions (trust/untrust/delete) for the /certificates page.
         services.AddSingleton<Certificates.CertificateStoreManager>();