Add automatic AreaCity catalog bootstrap and region tree management

src/ElectionSystem.Api/Components/Pages/Admin/RegionTreeNode.cs

@@ -0,0 +1,3 @@
+using ElectionSystem.Api.Modules.Organization.Domain;
+namespace ElectionSystem.Api.Components.Pages.Admin;
+public sealed class RegionTreeNode(Guid id, string code, string name, AdministrativeRegionLevel level, bool active) { public Guid Id { get; } = id; public string Code { get; } = code; public string Name { get; } = name; public AdministrativeRegionLevel Level { get; } = level; public bool Active { get; } = active; public bool Expanded { get; set; } public List<RegionTreeNode>? Children { get; set; } }