Initial commit

src/PowderCoating.Application/DTOs/Import/PurchaseOrderImportDto.cs

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+using CsvHelper.Configuration.Attributes;
+
+namespace PowderCoating.Application.DTOs.Import;
+
+/// <summary>
+/// DTO for importing purchase order headers from CSV. Column names match the native
+/// ExportPurchaseOrdersCsv output for round-trip compatibility. Upsert key is PoNumber.
+/// </summary>
+public class PurchaseOrderImportDto
+{
+    [Name("PoNumber")]
+    public string? PoNumber { get; set; }
+
+    /// <summary>Vendor company name — must match an existing vendor record.</summary>
+    [Name("Vendor")]
+    public string? Vendor { get; set; }
+
+    /// <summary>
+    /// Valid values: Draft, Submitted, PartiallyReceived, Received, Cancelled
+    /// </summary>
+    [Name("Status")]
+    public string Status { get; set; } = "Draft";
+
+    [Name("OrderDate")]
+    public DateTime OrderDate { get; set; }
+
+    [Name("ExpectedDeliveryDate")]
+    public DateTime? ExpectedDeliveryDate { get; set; }
+
+    [Name("ReceivedDate")]
+    public DateTime? ReceivedDate { get; set; }
+
+    [Name("SubTotal")]
+    public decimal SubTotal { get; set; }
+
+    [Name("ShippingCost")]
+    public decimal ShippingCost { get; set; }
+
+    [Name("TotalAmount")]
+    public decimal TotalAmount { get; set; }
+
+    [Name("Notes")]
+    public string? Notes { get; set; }
+}