Initial commit

src/PowderCoating.Core/Entities/PurchaseOrder.cs

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+using PowderCoating.Core.Enums;
+
+namespace PowderCoating.Core.Entities;
+
+public class PurchaseOrder : BaseEntity
+{
+    public string PoNumber { get; set; } = string.Empty;
+
+    public int VendorId { get; set; }
+    public virtual Vendor Vendor { get; set; } = null!;
+
+    public PurchaseOrderStatus Status { get; set; } = PurchaseOrderStatus.Draft;
+
+    public DateTime OrderDate { get; set; } = DateTime.UtcNow;
+    public DateTime? ExpectedDeliveryDate { get; set; }
+    public DateTime? ReceivedDate { get; set; }
+
+    public decimal ShippingCost { get; set; } = 0;
+    public decimal SubTotal { get; set; } = 0;
+    public decimal TotalAmount { get; set; } = 0;
+
+    public string? Notes { get; set; }
+    public string? InternalNotes { get; set; }
+
+    // Optional link to a Bill created after receipt
+    public int? BillId { get; set; }
+    public virtual Bill? Bill { get; set; }
+
+    public virtual ICollection<PurchaseOrderItem> Items { get; set; } = new List<PurchaseOrderItem>();
+}
+
+public class PurchaseOrderItem : BaseEntity
+{
+    public int PurchaseOrderId { get; set; }
+    public virtual PurchaseOrder PurchaseOrder { get; set; } = null!;
+
+    // Null for custom/non-inventory line items
+    public int? InventoryItemId { get; set; }
+    public virtual InventoryItem? InventoryItem { get; set; }
+
+    // Used when InventoryItemId is null
+    public string? Description { get; set; }
+    public string? UnitOfMeasure { get; set; }
+
+    public decimal QuantityOrdered { get; set; }
+    public decimal QuantityReceived { get; set; } = 0;
+    public decimal UnitCost { get; set; }
+    public decimal LineTotal { get; set; }
+
+    public string? Notes { get; set; }
+}