Redo entities and configs, plus dummy aspnet identity config

src/Printbase.Domain/Entities/EntityBase.cs

@@ -0,0 +1,10 @@
+namespace Printbase.Domain.Entities;
+
+public abstract class EntityBase
+{
+    public Guid Id { get; set; }
+    public DateTime CreatedAt { get; set; }
+    public DateTime ModifiedAt { get; set; }
+    public string CreatedBy { get; set; }
+    public string ModifiedBy { get; set; }
+}