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/Clients/ServiceCollectionExtensions.cs

@@ -10,6 +10,7 @@ public static class ServiceCollectionExtensions
     ///     Registers the Admin UI client services in the dependency injection container.
     /// </summary>
     /// <param name="services">The service collection to register clients into.</param>
+    /// <returns>The same service collection, for chaining.</returns>
     public static IServiceCollection AddOtOpcUaAdminClients(this IServiceCollection services)
     {
         services.AddScoped<IAdminOperationsClient, AdminOperationsClient>();