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.Security/Ldap/ILdapAuthService.cs

@@ -2,5 +2,10 @@ namespace ZB.MOM.WW.OtOpcUa.Security.Ldap;
 
 public interface ILdapAuthService
 {
+    /// <summary>Authenticates a user against the LDAP service.</summary>
+    /// <param name="username">The username to authenticate.</param>
+    /// <param name="password">The password to verify.</param>
+    /// <param name="ct">A cancellation token.</param>
+    /// <returns>A task that returns the authentication result.</returns>
     Task<LdapAuthResult> AuthenticateAsync(string username, string password, CancellationToken ct = default);
 }