initial commit

backend/Domain/Entities/AmsUnit.cs

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+using Extrudex.Domain.Base;
+
+namespace Extrudex.Domain.Entities;
+
+/// <summary>
+/// Represents an AMS (Automatic Material System) unit installed on a Bambu Lab printer.
+/// Each AMS unit contains multiple slots that hold spools.
+/// </summary>
+public class AmsUnit : AuditableEntity
+{
+    /// <summary>
+    /// The 1-based index of this AMS unit on the printer (e.g., AMS 1, AMS 2).
+    /// </summary>
+    public int UnitIndex { get; set; }
+
+    /// <summary>
+    /// Foreign key to the parent Printer this AMS unit is installed on.
+    /// </summary>
+    public Guid PrinterId { get; set; }
+
+    /// <summary>
+    /// Navigation to the parent Printer.
+    /// </summary>
+    public Printer Printer { get; set; } = null!;
+
+    /// <summary>
+    /// Navigation collection of slots in this AMS unit.
+    /// </summary>
+    public ICollection<AmsSlot> Slots { get; set; } = new List<AmsSlot>();
+}