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/ServerCluster.cs

@@ -11,6 +11,7 @@ public sealed class ServerCluster
     /// <summary>Stable logical ID, e.g. "LINE3-OPCUA".</summary>
     public required string ClusterId { get; set; }
 
+    /// <summary>Gets or sets the display name for the server cluster.</summary>
     public required string Name { get; set; }
 
     /// <summary>UNS level 1. Canonical org value: "zb" per decision #140.</summary>
@@ -19,23 +20,33 @@ public sealed class ServerCluster
     /// <summary>UNS level 2, e.g. "warsaw-west".</summary>
     public required string Site { get; set; }
 
+    /// <summary>Gets or sets the number of nodes in the cluster.</summary>
     public byte NodeCount { get; set; }
 
+    /// <summary>Gets or sets the redundancy mode for the cluster.</summary>
     public required RedundancyMode RedundancyMode { get; set; }
 
+    /// <summary>Gets or sets a value indicating whether the cluster is enabled.</summary>
     public bool Enabled { get; set; } = true;
 
+    /// <summary>Gets or sets optional notes about the cluster.</summary>
     public string? Notes { get; set; }
 
+    /// <summary>Gets or sets the UTC timestamp when the cluster was created.</summary>
     public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
 
+    /// <summary>Gets or sets the user who created the cluster.</summary>
     public required string CreatedBy { get; set; }
 
+    /// <summary>Gets or sets the UTC timestamp when the cluster was last modified.</summary>
     public DateTime? ModifiedAt { get; set; }
 
+    /// <summary>Gets or sets the user who last modified the cluster.</summary>
     public string? ModifiedBy { get; set; }
 
     // Navigation
+    /// <summary>Gets or sets the collection of cluster nodes.</summary>
     public ICollection<ClusterNode> Nodes { get; set; } = [];
+    /// <summary>Gets or sets the collection of namespaces in the cluster.</summary>
     public ICollection<Namespace> Namespaces { get; set; } = [];
 }