Initial commit: HelpDesk ICHN - .NET 10 backend + Next.js 16 frontend

backend/HelpDesk.Models/Entities/ActivityLog.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace HelpDesk.Models.Entities;
+
+[Table("activity_logs")]
+public class ActivityLog
+{
+    [Key]
+    public Guid Id { get; set; }
+
+    public Guid? UserId { get; set; }
+
+    [Required]
+    [MaxLength(100)]
+    public string EntityType { get; set; } = string.Empty;
+
+    public int? EntityId { get; set; }
+
+    [Required]
+    [MaxLength(100)]
+    public string Action { get; set; } = string.Empty;
+
+    public string? Details { get; set; }
+
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+
+    // Navigation
+    public User? User { get; set; }
+}

backend/HelpDesk.Models/Entities/Group.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace HelpDesk.Models.Entities;
+
+[Table("groups")]
+public class Group
+{
+    [Key]
+    public Guid Id { get; set; }
+
+    [Required]
+    [MaxLength(100)]
+    public string Name { get; set; } = string.Empty;
+
+    [MaxLength(500)]
+    public string? Description { get; set; }
+
+    public bool IsActive { get; set; } = true;
+
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+
+    // Navigation
+    public ICollection<Ticket> Tickets { get; set; } = new List<Ticket>();
+}

backend/HelpDesk.Models/Entities/KnowledgeBaseArticle.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace HelpDesk.Models.Entities;
+
+[Table("knowledge_base_articles")]
+public class KnowledgeBaseArticle
+{
+    [Key]
+    public Guid Id { get; set; }
+
+    [Required]
+    [MaxLength(200)]
+    public string Title { get; set; } = string.Empty;
+
+    [Required]
+    public string Content { get; set; } = string.Empty;
+
+    public Guid CategoryId { get; set; }
+    public Guid AuthorId { get; set; }
+
+    public bool IsPublished { get; set; }
+    public int ViewCount { get; set; }
+
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
+
+    // Navigation
+    public KnowledgeBaseCategory Category { get; set; } = null!;
+    public User Author { get; set; } = null!;
+}

backend/HelpDesk.Models/Entities/KnowledgeBaseCategory.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace HelpDesk.Models.Entities;
+
+[Table("knowledge_base_categories")]
+public class KnowledgeBaseCategory
+{
+    [Key]
+    public Guid Id { get; set; }
+
+    [Required]
+    [MaxLength(100)]
+    public string Name { get; set; } = string.Empty;
+
+    [MaxLength(500)]
+    public string? Description { get; set; }
+
+    public int SortOrder { get; set; }
+
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+
+    // Navigation
+    public ICollection<KnowledgeBaseArticle> Articles { get; set; } = new List<KnowledgeBaseArticle>();
+}

backend/HelpDesk.Models/Entities/SLAPolicy.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace HelpDesk.Models.Entities;
+
+[Table("sla_policies")]
+public class SLAPolicy
+{
+    [Key]
+    public Guid Id { get; set; }
+
+    [Required]
+    [MaxLength(100)]
+    public string Name { get; set; } = string.Empty;
+
+    [MaxLength(500)]
+    public string? Description { get; set; }
+
+    public int ResponseTimeHours { get; set; }
+    public int ResolutionTimeHours { get; set; }
+
+    public bool IsActive { get; set; } = true;
+
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+
+    // Navigation
+    public ICollection<Ticket> Tickets { get; set; } = new List<Ticket>();
+}

backend/HelpDesk.Models/Entities/Ticket.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using HelpDesk.Models.Enums;
+
+namespace HelpDesk.Models.Entities;
+
+[Table("tickets")]
+public class Ticket
+{
+    [Key]
+    public Guid Id { get; set; }
+
+    [Required]
+    [MaxLength(200)]
+    public string Title { get; set; } = string.Empty;
+
+    [Required]
+    public string Description { get; set; } = string.Empty;
+
+    [Required]
+    [MaxLength(50)]
+    public TicketStatus Status { get; set; } = TicketStatus.Open;
+
+    [Required]
+    [MaxLength(50)]
+    public TicketPriority Priority { get; set; } = TicketPriority.Medium;
+
+    [Required]
+    [MaxLength(50)]
+    public string TicketNumber { get; set; } = string.Empty;
+
+    public Guid RequesterId { get; set; }
+    public Guid? AssigneeId { get; set; }
+    public Guid? GroupId { get; set; }
+    public Guid? SlaPolicyId { get; set; }
+
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime? FirstResponseAt { get; set; }
+    public DateTime? ResolvedAt { get; set; }
+    public DateTime? ClosedAt { get; set; }
+
+    // Navigation
+    public User Requester { get; set; } = null!;
+    public User? Assignee { get; set; }
+    public Group? Group { get; set; }
+    public SLAPolicy? SlaPolicy { get; set; }
+    public ICollection<TicketComment> Comments { get; set; } = new List<TicketComment>();
+}

backend/HelpDesk.Models/Entities/TicketComment.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace HelpDesk.Models.Entities;
+
+[Table("ticket_comments")]
+public class TicketComment
+{
+    [Key]
+    public Guid Id { get; set; }
+
+    public Guid TicketId { get; set; }
+    public Guid UserId { get; set; }
+
+    [Required]
+    public string Content { get; set; } = string.Empty;
+
+    public bool IsInternal { get; set; }
+
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+
+    // Navigation
+    public Ticket Ticket { get; set; } = null!;
+    public User User { get; set; } = null!;
+}

backend/HelpDesk.Models/Entities/User.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using HelpDesk.Models.Enums;
+
+namespace HelpDesk.Models.Entities;
+
+[Table("users")]
+public class User
+{
+    [Key]
+    public Guid Id { get; set; }
+
+    [Required]
+    [MaxLength(100)]
+    public string FirstName { get; set; } = string.Empty;
+
+    [Required]
+    [MaxLength(100)]
+    public string LastName { get; set; } = string.Empty;
+
+    [Required]
+    [MaxLength(256)]
+    public string Email { get; set; } = string.Empty;
+
+    [Required]
+    [MaxLength(500)]
+    public string PasswordHash { get; set; } = string.Empty;
+
+    [Required]
+    [MaxLength(50)]
+    public UserRole Role { get; set; } = UserRole.Customer;
+
+    public bool IsActive { get; set; } = true;
+
+    [MaxLength(50)]
+    public string? PhoneNumber { get; set; }
+
+    [MaxLength(500)]
+    public string? AvatarUrl { get; set; }
+
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
+
+    // Navigation
+    public ICollection<Ticket> RequestedTickets { get; set; } = new List<Ticket>();
+    public ICollection<Ticket> AssignedTickets { get; set; } = new List<Ticket>();
+    public ICollection<TicketComment> Comments { get; set; } = new List<TicketComment>();
+    public ICollection<KnowledgeBaseArticle> Articles { get; set; } = new List<KnowledgeBaseArticle>();
+    public ICollection<ActivityLog> ActivityLogs { get; set; } = new List<ActivityLog>();
+}