Add EventComment DTOs

BusinessLayer/DTOs/EventComment/EventCommentCreateDTO.cs

+using System.ComponentModel.DataAnnotations;
+
+namespace BusinessLayer.DTOs.EventComment
+{
+    public class EventCommentCreateDTO
+    {
+        [Required]
+        public Guid PosterId { get; set; }
+
+        [Required]
+        public Guid EventId { get; set; }
+
+        public Guid? ParentCommentId { get; set; }
+
+        [Required]
+        [MaxLength(1800)]
+        public string Content { get; set; }
+    }
+}

BusinessLayer/DTOs/EventComment/EventCommentDTO.cs

+using BusinessLayer.DTOs.Event;
+using BusinessLayer.DTOs.User;
+
+namespace BusinessLayer.DTOs.EventComment
+{
+    public class EventCommentDTO
+    {
+        public Guid Id { get; set; }
+        public UserDTO? Poster { get; set; }
+        public Guid EventId { get; set; }
+        public EventDTO? Event { get; set; }
+        public Guid? ParentCommentId { get; set; }
+        public List<EventCommentDTO> ChildComments { get; set; } = new List<EventCommentDTO>();
+        public required string Content { get; set; }
+        public DateTime CreatedAt { get; set; }
+        public DateTime UpdatedAt { get; set; }
+        public DateTime? DeletedAt { get; set; }
+    }
+}

BusinessLayer/DTOs/EventComment/EventCommentUpdateDTO.cs

+using System.ComponentModel.DataAnnotations;
+
+namespace BusinessLayer.DTOs.EventComment
+{
+    public class EventCommentUpdateDTO
+    {
+        [Required]
+        [MaxLength(1800)]
+        public required string Content { get; set; }
+    }
+}