Expand XML docs across bridge and test code

src/ZB.MOM.WW.LmxOpcUa.Host/Configuration/ConfigurationValidator.cs

@@ -9,6 +9,11 @@ namespace ZB.MOM.WW.LmxOpcUa.Host.Configuration
     {
         private static readonly ILogger Log = Serilog.Log.ForContext(typeof(ConfigurationValidator));
 
+        /// <summary>
+        /// Validates the effective host configuration and writes the resolved values to the startup log before service initialization continues.
+        /// </summary>
+        /// <param name="config">The bound service configuration that drives OPC UA hosting, MXAccess connectivity, Galaxy queries, and dashboard behavior.</param>
+        /// <returns><see langword="true"/> when the required settings are present and within supported bounds; otherwise, <see langword="false"/>.</returns>
         public static bool ValidateAndLog(AppConfiguration config)
         {
             bool valid = true;