Initial commit

src/PowderCoating.Core/Entities/QuoteItemCoat.cs

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+namespace PowderCoating.Core.Entities;
+
+/// <summary>
+/// Represents a single coating layer applied to a quote item.
+/// Supports multi-coat configurations (primer, base coat, top coat, clear coat, etc.)
+/// </summary>
+public class QuoteItemCoat : BaseEntity
+{
+    // Parent relationship
+    public int QuoteItemId { get; set; }
+
+    // Coat identification (user-defined)
+    public string CoatName { get; set; } = string.Empty; // "Primer", "Base Coat", "Top Coat", etc.
+    public int Sequence { get; set; } // 1, 2, 3... for ordering
+
+    // Powder selection (same pattern as current QuoteItem)
+    public int? InventoryItemId { get; set; }  // In-stock powder
+    public string? ColorName { get; set; }      // Color name
+    public int? VendorId { get; set; }          // Vendor for custom powder
+    public string? ColorCode { get; set; }      // RAL code, etc.
+    public string? Finish { get; set; }         // Gloss, Matte, Textured, etc.
+
+    // Coverage parameters (defaults from inventory or user-specified)
+    public decimal CoverageSqFtPerLb { get; set; } = 30m;
+    public decimal TransferEfficiency { get; set; } = 65m;
+
+    // Cost override for custom powder
+    public decimal? PowderCostPerLb { get; set; }  // $/lb for custom orders
+    public decimal? PowderToOrder { get; set; }     // Pounds to order (rounded up from needed)
+
+    // Calculated costs (stored for audit trail)
+    public decimal CoatMaterialCost { get; set; }
+    public decimal CoatLaborCost { get; set; }
+    public decimal CoatTotalCost { get; set; }
+
+    // Notes
+    public string? Notes { get; set; }
+
+    // Navigation properties
+    public virtual QuoteItem QuoteItem { get; set; } = null!;
+    public virtual InventoryItem? InventoryItem { get; set; }
+    public virtual Vendor? Vendor { get; set; }
+}