Initial

LehrerApp.Core/Models/Student.cs

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+namespace LehrerApp.Core.Models;
+
+public class Student
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    public string FirstName { get; set; } = "";
+    public string LastName { get; set; } = "";
+    public string FullName => $"{LastName}, {FirstName}";
+    public DateOnly? DateOfBirth { get; set; }
+    public Gender? Gender { get; set; }
+    public List<Contact> Contacts { get; set; } = [];
+    public string? Notes { get; set; }
+    public bool IsActive { get; set; } = true;
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
+}
+
+public class Contact
+{
+    public string Name { get; set; } = "";
+    public string Relation { get; set; } = "";   // "Mutter", "Vater", "Vormund"
+    public string? Phone { get; set; }
+    public string? Email { get; set; }
+}
+
+public enum Gender { M, W, D }