Refactor IPAM model classes to use records for Address, Subnetwork, Vlan, Vrf, Section, Tag, Domain, Nameserver, and Session; enhance documentation and implement value equality for records.

classlib/class/nameserver.cs

@@ -1,8 +1,13 @@
 namespace PS.IPAM;
+
 using System;
 
+/// <summary>
+/// Represents a nameserver configuration in phpIPAM.
+/// </summary>
 [Serializable]
-public class Nameserver {
+public sealed record Nameserver
+{
     public int Id { get; }
     public string Name { get; }
     public string[] NameServers { get; }
@@ -16,13 +21,15 @@ public class Nameserver {
         string nameServers,
         string description,
         string permissions,
-        DateTime? editDate
-    ) {
-        this.Id          = id;
-        this.Name        = name;
-        this.NameServers = nameServers.Split(new char[] {';'});
-        this.Description = description;
-        this.Permissions = permissions;
-        this.EditDate    = editDate;
+        DateTime? editDate)
+    {
+        Id = id;
+        Name = name;
+        NameServers = nameServers?.Split(';', StringSplitOptions.RemoveEmptyEntries) ?? Array.Empty<string>();
+        Description = description;
+        Permissions = permissions;
+        EditDate = editDate;
     }
-}
+
+    public override string ToString() => Name;
+}