docs(xmldoc): fill missing XML docs + strip tracking-ID comments across src

Adds <summary>/<param>/<returns>/<inheritdoc> where missing and removes
project bookkeeping IDs (task/tracking refs) from shipped code comments,
so the docs read cleanly and CommentChecker is quiet except for known
false positives (PLC/protocol terms, event/IEqualityComparer inheritdoc).
Doc/comment-only; no logic changed; solution builds clean.

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

@@ -19,6 +19,7 @@ public static class EndpointRouteBuilderExtensions
     /// </summary>
     /// <typeparam name="TApp">The root component type for Razor pages.</typeparam>
     /// <param name="app">The endpoint route builder.</param>
+    /// <returns>The same endpoint route builder, for chaining.</returns>
     public static IEndpointRouteBuilder MapAdminUI<TApp>(this IEndpointRouteBuilder app)
         where TApp : IComponent
     {
@@ -34,6 +35,7 @@ public static class EndpointRouteBuilderExtensions
     /// Adds AdminUI services to the dependency injection container.
     /// </summary>
     /// <param name="services">The service collection.</param>
+    /// <returns>The same service collection, for chaining.</returns>
     public static IServiceCollection AddAdminUI(this IServiceCollection services)
     {
         services.AddRazorComponents().AddInteractiveServerComponents();