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/Entities/ClusterNodeCredential.cs

@@ -8,22 +8,30 @@ namespace ZB.MOM.WW.OtOpcUa.Configuration.Entities;
 /// </summary>
 public sealed class ClusterNodeCredential
 {
+    /// <summary>Gets or sets the credential identifier.</summary>
     public Guid CredentialId { get; set; }
 
+    /// <summary>Gets or sets the node identifier this credential binds to.</summary>
     public required string NodeId { get; set; }
 
+    /// <summary>Gets or sets the credential kind (login, certificate, etc.).</summary>
     public required CredentialKind Kind { get; set; }
 
-    /// <summary>Login name / cert thumbprint / SID / gMSA name.</summary>
+    /// <summary>Gets or sets the credential value (login name / cert thumbprint / SID / gMSA name).</summary>
     public required string Value { get; set; }
 
+    /// <summary>Gets or sets a value indicating whether the credential is enabled.</summary>
     public bool Enabled { get; set; } = true;
 
+    /// <summary>Gets or sets the date/time when the credential was last rotated.</summary>
     public DateTime? RotatedAt { get; set; }
 
+    /// <summary>Gets or sets the date/time when the credential was created.</summary>
     public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
 
+    /// <summary>Gets or sets the user who created the credential.</summary>
     public required string CreatedBy { get; set; }
 
+    /// <summary>Gets or sets the related cluster node.</summary>
     public ClusterNode? Node { get; set; }
 }