initial commit

backend/Domain/Entities/AmsSlot.cs

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+using Extrudex.Domain.Base;
+
+namespace Extrudex.Domain.Entities;
+
+/// <summary>
+/// Represents a single slot within an AMS unit. Each slot can hold one spool
+/// and tracks the tray index, remaining weight, and which spool is loaded.
+/// </summary>
+public class AmsSlot : AuditableEntity
+{
+    /// <summary>
+    /// The 1-based tray/slot index within the AMS unit (1-4 per unit).
+    /// </summary>
+    public int TrayIndex { get; set; }
+
+    /// <summary>
+    /// Foreign key to the AMS unit this slot belongs to.
+    /// </summary>
+    public Guid AmsUnitId { get; set; }
+
+    /// <summary>
+    /// Navigation to the parent AMS unit.
+    /// </summary>
+    public AmsUnit AmsUnit { get; set; } = null!;
+
+    /// <summary>
+    /// Foreign key to the spool currently loaded in this slot. Null if empty.
+    /// </summary>
+    public Guid? SpoolId { get; set; }
+
+    /// <summary>
+    /// Navigation to the spool currently loaded in this slot. Null if no spool is loaded.
+    /// </summary>
+    public Spool? Spool { get; set; }
+
+    /// <summary>
+    /// Remaining filament weight in grams as reported by the AMS.
+    /// Bambu Lab AMS reports remaining weight per tray.
+    /// </summary>
+    public decimal? RemainingWeightG { get; set; }
+}