Add Announcements and Dashboard controllers with all DTOs

backend/DTOs/AnnouncementDtos.cs

@@ -0,0 +1,42 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace RacePlannerApi.DTOs;
+
+public class CreateAnnouncementRequest
+{
+    [Required]
+    public Guid EventId { get; set; }
+
+    [Required]
+    [MaxLength(200)]
+    public string Title { get; set; } = string.Empty;
+
+    [Required]
+    [MaxLength(5000)]
+    public string Content { get; set; } = string.Empty;
+}
+
+public class UpdateAnnouncementRequest
+{
+    [MaxLength(200)]
+    public string? Title { get; set; }
+
+    [MaxLength(5000)]
+    public string? Content { get; set; }
+
+    public bool? IsPublished { get; set; }
+}
+
+public class AnnouncementDto
+{
+    public Guid Id { get; set; }
+    public Guid EventId { get; set; }
+    public string EventName { get; set; } = string.Empty;
+    public string Title { get; set; } = string.Empty;
+    public string Content { get; set; } = string.Empty;
+    public Guid AuthorId { get; set; }
+    public string AuthorName { get; set; } = string.Empty;
+    public DateTime CreatedAt { get; set; }
+    public DateTime? UpdatedAt { get; set; }
+    public bool IsPublished { get; set; }
+}