feat(templates): add TemplateFolder entity and Template.FolderId

src/ScadaLink.Commons/Entities/Templates/Template.cs

@@ -6,6 +6,7 @@ public class Template
     public string Name { get; set; }
     public string? Description { get; set; }
     public int? ParentTemplateId { get; set; }
+    public int? FolderId { get; set; }
     public ICollection<TemplateAttribute> Attributes { get; set; } = new List<TemplateAttribute>();
     public ICollection<TemplateAlarm> Alarms { get; set; } = new List<TemplateAlarm>();
     public ICollection<TemplateScript> Scripts { get; set; } = new List<TemplateScript>();

src/ScadaLink.Commons/Entities/Templates/TemplateFolder.cs

@@ -0,0 +1,14 @@
+namespace ScadaLink.Commons.Entities.Templates;
+
+public class TemplateFolder
+{
+    public int Id { get; set; }
+    public string Name { get; set; }
+    public int? ParentFolderId { get; set; }
+    public int SortOrder { get; set; }
+
+    public TemplateFolder(string name)
+    {
+        Name = name ?? throw new ArgumentNullException(nameof(name));
+    }
+}