Initial commit

src/PowderCoating.Core/Entities/QuoteItem.cs

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+namespace PowderCoating.Core.Entities;
+
+public class QuoteItem : BaseEntity
+{
+    public int QuoteId { get; set; }
+    public string Description { get; set; } = string.Empty;
+    public decimal Quantity { get; set; }
+    
+    // Measurements (optional for quoting)
+    public decimal? SurfaceArea { get; set; }
+    public decimal SurfaceAreaSqFt { get; set; }  // Surface area in square feet for pricing
+
+    // Catalog item reference (optional)
+    public int? CatalogItemId { get; set; }  // Link to catalog item (optional)
+
+    // Pricing
+    public decimal UnitPrice { get; set; }
+    public decimal TotalPrice { get; set; }
+
+    // Cost breakdown snapshot (set at save time for breakdown display)
+    public decimal ItemMaterialCost { get; set; }
+    public decimal ItemLaborCost { get; set; }
+    public decimal ItemEquipmentCost { get; set; }
+    public bool IsGenericItem { get; set; }
+    public decimal? ManualUnitPrice { get; set; }
+    public decimal? PowderCostOverride { get; set; }  // Optional unit price override for catalog items
+    public bool IsLaborItem { get; set; }
+    public bool IsSalesItem { get; set; }
+    public string? Sku { get; set; }
+    
+    // Processing estimates
+    public bool RequiresSandblasting { get; set; }
+    public bool RequiresMasking { get; set; }
+    public int EstimatedMinutes { get; set; }
+    
+    public string? Notes { get; set; }
+
+    // Part complexity level — applies a price multiplier for calculated items
+    // Values: "Simple" | "Moderate" | "Complex" | "Extreme"
+    public string? Complexity { get; set; }
+
+    // True when this item was generated via AI photo analysis.
+    // Must be persisted so that recalculations (Details view, Edit view) can
+    // honour ManualUnitPrice instead of running the regular pricing engine.
+    public bool IsAiItem { get; set; }
+
+    // AI-generated standardized tags (comma-separated, e.g. "automotive,tubular")
+    public string? AiTags { get; set; }
+
+    // Link to shared AI prediction record (null for non-AI items)
+    public int? AiPredictionId { get; set; }
+    public virtual AiItemPrediction? AiPrediction { get; set; }
+
+    // Relationships
+    public virtual Quote Quote { get; set; } = null!;
+    public virtual CatalogItem? CatalogItem { get; set; }
+    public virtual ICollection<QuoteItemCoat> Coats { get; set; } = new List<QuoteItemCoat>();
+    public virtual ICollection<QuoteItemPrepService> PrepServices { get; set; } = new List<QuoteItemPrepService>();
+}