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/Server/ZB.MOM.WW.OtOpcUa.Host/OpcUa/LdapOpcUaUserAuthenticator.cs

@@ -16,6 +16,10 @@ public sealed class LdapOpcUaUserAuthenticator(
     ILogger<LdapOpcUaUserAuthenticator> logger)
     : IOpcUaUserAuthenticator
 {
+    /// <summary>Authenticates an OPC UA UserName token via LDAP.</summary>
+    /// <param name="username">The username to authenticate.</param>
+    /// <param name="password">The password to authenticate.</param>
+    /// <param name="ct">Cancellation token.</param>
     public async Task<OpcUaUserAuthResult> AuthenticateUserNameAsync(string username, string password, CancellationToken ct)
     {
         try