docs: backfill XML documentation across 756 files

Adds <summary>, <param>, <typeparam>, and <inheritdoc/> tags to public
members surfaced by commentchecker — resolves 5,847 of 5,869 issues
(99.6%) across three /fixdocs passes.

src/Core/ZB.MOM.WW.OtOpcUa.Configuration/ServiceCollectionExtensions.cs

@@ -12,6 +12,9 @@ public static class ServiceCollectionExtensions
     /// Registers <see cref="IDbContextFactory{TContext}"/> for <see cref="OtOpcUaConfigDbContext"/>
     /// using the connection string named <c>ConfigDb</c> from <see cref="IConfiguration"/>.
     /// </summary>
+    /// <param name="services">The service collection to configure.</param>
+    /// <param name="configuration">The application configuration.</param>
+    /// <returns>The service collection for chaining.</returns>
     public static IServiceCollection AddOtOpcUaConfigDb(this IServiceCollection services, IConfiguration configuration)
     {
         var connectionString = configuration.GetConnectionString(ConnectionStringName)