feat(adminui): FleetStatusHub + AlertHub + MapOtOpcUaHubs (broadcaster bridge tracked as F16)

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Hubs/AlertHub.cs

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+using Microsoft.AspNetCore.SignalR;
+
+namespace ZB.MOM.WW.OtOpcUa.AdminUI.Hubs;
+
+/// <summary>Browser-facing alert / toast push channel. Bridge wiring staged for F16.</summary>
+public sealed class AlertHub : Hub
+{
+    public const string Endpoint = "/hubs/alerts";
+}

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Hubs/FleetStatusHub.cs

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+using Microsoft.AspNetCore.SignalR;
+using ZB.MOM.WW.OtOpcUa.Commons.Messages.Fleet;
+
+namespace ZB.MOM.WW.OtOpcUa.AdminUI.Hubs;
+
+/// <summary>
+/// Browser-facing fleet-status push channel. Subscribers receive <see cref="FleetStatusChanged"/>
+/// snapshots whenever the admin-role <c>FleetStatusBroadcaster</c> publishes a diff.
+///
+/// Server-side bridge from <c>FleetStatusBroadcaster.broadcast</c> → <c>IHubContext&lt;FleetStatusHub&gt;</c>
+/// is staged for follow-up F16. For now the hub is a passive channel; SignalR clients connect
+/// and stay idle until the bridge lands.
+/// </summary>
+public sealed class FleetStatusHub : Hub
+{
+    public const string Endpoint = "/hubs/fleet-status";
+    public const string MethodName = "fleetStatusChanged";
+}

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Hubs/HubRouteBuilderExtensions.cs

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+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Routing;
+
+namespace ZB.MOM.WW.OtOpcUa.AdminUI.Hubs;
+
+public static class HubRouteBuilderExtensions
+{
+    public static IEndpointRouteBuilder MapOtOpcUaHubs(this IEndpointRouteBuilder app)
+    {
+        app.MapHub<FleetStatusHub>(FleetStatusHub.Endpoint);
+        app.MapHub<AlertHub>(AlertHub.Endpoint);
+        return app;
+    }
+}