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/domain.cs

@@ -1,27 +1,17 @@
 namespace PS.IPAM;
+
 using System;
 
+/// <summary>
+/// Represents an L2 domain in phpIPAM.
+/// </summary>
 [Serializable]
-public class Domain {
-    public int Id { get; }
-    public string Name { get; }
-    public string Description { get; }
-    public string Sections { get; }
-
-    public Domain (
-        int id,
-        string name,
-        string description,
-        string sections
-    ) {
-        this.Id          = id;
-        this.Name        = name;
-        this.Description = description;
-        this.Sections    = sections;
-    }
-
-    public override string ToString()
-    {
-        return this.Name;
-    }
-}
+public sealed record Domain(
+    int Id,
+    string Name,
+    string Description,
+    string Sections
+)
+{
+    public override string ToString() => Name;
+}