feat: add Auditable attribute to Chat entity and create migration

Added [Auditable] attribute to the Chat entity to enable auditing functionality. Created a new migration (AddAuditableToChat) that adds InsertTime, IsRemoved, and RemoveTime columns to the Chat table, along with the necessary database schema updates to support the auditing behavior.

Complex.Domain/Entities/Chat.cs

@@ -2,6 +2,7 @@
 
 namespace Complex.Domain.Entities
 {
+    [Auditable]
     public class Chat:BaseEntity<long>
     {
         public Guid ComplexId { set; get; }