WIP: Project setup with .NET backend and Next.js frontend

backend/Models/Announcement.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace RacePlannerApi.Models;
+
+public class Announcement
+{
+    [Key]
+    public Guid Id { get; set; } = Guid.NewGuid();
+
+    [Required]
+    [MaxLength(200)]
+    public string Title { get; set; } = string.Empty;
+
+    [Required]
+    [MaxLength(5000)]
+    public string Content { get; set; } = string.Empty;
+
+    [Required]
+    public Guid EventId { get; set; }
+
+    [ForeignKey("EventId")]
+    public Event Event { get; set; } = null!;
+
+    [Required]
+    public Guid AuthorId { get; set; }
+
+    [ForeignKey("AuthorId")]
+    public User Author { get; set; } = null!;
+
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+
+    public DateTime? UpdatedAt { get; set; }
+
+    public bool IsPublished { get; set; } = true;
+}

backend/Models/Event.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace RacePlannerApi.Models;
+
+public class Event
+{
+    [Key]
+    public Guid Id { get; set; } = Guid.NewGuid();
+
+    [Required]
+    [MaxLength(200)]
+    public string Name { get; set; } = string.Empty;
+
+    [MaxLength(2000)]
+    public string Description { get; set; } = string.Empty;
+
+    [Required]
+    public DateTime EventDate { get; set; }
+
+    [Required]
+    [MaxLength(500)]
+    public string Location { get; set; } = string.Empty;
+
+    public EventStatus Status { get; set; } = EventStatus.Draft;
+
+    [MaxLength(100)]
+    public string? Category { get; set; }
+
+    public List<string> Tags { get; set; } = new List<string>();
+
+    public int? MaxParticipants { get; set; }
+
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+
+    public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
+
+    // Foreign keys
+    [Required]
+    public Guid OrganizerId { get; set; }
+
+    [ForeignKey("OrganizerId")]
+    public User Organizer { get; set; } = null!;
+
+    // Navigation properties
+    public ICollection<Registration> Registrations { get; set; } = new List<Registration>();
+    public ICollection<Announcement> Announcements { get; set; } = new List<Announcement>();
+}
+
+public enum EventStatus
+{
+    Draft,
+    Published,
+    Cancelled,
+    Completed
+}

backend/Models/Payment.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace RacePlannerApi.Models;
+
+public class Payment
+{
+    [Key]
+    public Guid Id { get; set; } = Guid.NewGuid();
+
+    [Required]
+    public Guid RegistrationId { get; set; }
+
+    [ForeignKey("RegistrationId")]
+    public Registration Registration { get; set; } = null!;
+
+    [Required]
+    public decimal Amount { get; set; }
+
+    [Required]
+    public PaymentMethod Method { get; set; }
+
+    [MaxLength(100)]
+    public string? TransactionId { get; set; }
+
+    [MaxLength(500)]
+    public string? Notes { get; set; }
+
+    public DateTime PaymentDate { get; set; } = DateTime.UtcNow;
+
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+}
+
+public enum PaymentMethod
+{
+    Cash,
+    Online,
+    Transfer
+}

backend/Models/Registration.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace RacePlannerApi.Models;
+
+public class Registration
+{
+    [Key]
+    public Guid Id { get; set; } = Guid.NewGuid();
+
+    [Required]
+    public Guid EventId { get; set; }
+
+    [ForeignKey("EventId")]
+    public Event Event { get; set; } = null!;
+
+    [Required]
+    public Guid ParticipantId { get; set; }
+
+    [ForeignKey("ParticipantId")]
+    public User Participant { get; set; } = null!;
+
+    public RegistrationStatus Status { get; set; } = RegistrationStatus.Pending;
+
+    [MaxLength(100)]
+    public string? Category { get; set; }
+
+    [MaxLength(200)]
+    public string? EmergencyContact { get; set; }
+
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+
+    public DateTime? UpdatedAt { get; set; }
+
+    // Navigation properties
+    public ICollection<Payment> Payments { get; set; } = new List<Payment>();
+}
+
+public enum RegistrationStatus
+{
+    Pending,
+    Confirmed,
+    Cancelled,
+    Completed
+}

backend/Models/User.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace RacePlannerApi.Models;
+
+public class User
+{
+    [Key]
+    public Guid Id { get; set; } = Guid.NewGuid();
+
+    [Required]
+    [EmailAddress]
+    public string Email { get; set; } = string.Empty;
+
+    [Required]
+    public string PasswordHash { get; set; } = string.Empty;
+
+    [Required]
+    [MaxLength(100)]
+    public string Name { get; set; } = string.Empty;
+
+    [Required]
+    public UserRole Role { get; set; } = UserRole.Participant;
+
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+
+    // Navigation properties
+    public ICollection<Event> OrganizedEvents { get; set; } = new List<Event>();
+    public ICollection<Registration> Registrations { get; set; } = new List<Registration>();
+}
+
+public enum UserRole
+{
+    Participant,
+    Organizer
+}