Merge feature/custom-formula-templates into dev

src/PowderCoating.Core/Entities/CustomItemTemplate.cs

@@ -0,0 +1,38 @@
+namespace PowderCoating.Core.Entities;
+
+/// <summary>
+/// A per-company reusable pricing formula template. Users define named input fields and an
+/// NCalc expression that produces either a fixed dollar amount (FixedRate) or a surface area
+/// in square feet (SurfaceAreaSqFt) that feeds the standard coatings pricing path.
+/// </summary>
+public class CustomItemTemplate : BaseEntity
+{
+    public string Name { get; set; } = string.Empty;
+    public string? Description { get; set; }
+
+    /// <summary>"FixedRate" or "SurfaceAreaSqFt" — controls which pricing path is used after evaluation.</summary>
+    public string OutputMode { get; set; } = "FixedRate";
+
+    /// <summary>JSON array of field definitions: [{name, label, unit, defaultValue}]</summary>
+    public string FieldsJson { get; set; } = "[]";
+
+    /// <summary>NCalc expression using field name slugs and the reserved variable 'rate'.</summary>
+    public string Formula { get; set; } = string.Empty;
+
+    /// <summary>Default rate value populated into the quote wizard; user can override per quote.</summary>
+    public decimal? DefaultRate { get; set; }
+
+    /// <summary>Display label for the rate field, e.g. "$/sq in" or "$/lb".</summary>
+    public string? RateLabel { get; set; }
+
+    public string? Notes { get; set; }
+    public int DisplayOrder { get; set; }
+    public bool IsActive { get; set; } = true;
+
+    /// <summary>
+    /// Optional reference diagram (shop drawing, sketch) stored in blob storage.
+    /// Shown in the template editor and quote wizard so users know which measurements to take.
+    /// Path format: {companyId}/{templateId}/diagram.{ext}
+    /// </summary>
+    public string? DiagramImagePath { get; set; }
+}

src/PowderCoating.Core/Entities/JobItem.cs

@@ -52,6 +52,14 @@ public class JobItem : BaseEntity
     public int? AiPredictionId { get; set; }
     public virtual AiItemPrediction? AiPrediction { get; set; }
 
+    // Custom formula item — see IsCustomFormulaItem routing in PricingCalculationService
+    public bool IsCustomFormulaItem { get; set; }
+    public int? CustomItemTemplateId { get; set; }
+    public virtual CustomItemTemplate? CustomItemTemplate { get; set; }
+
+    /// <summary>Snapshot of field name/value pairs used in the formula, stored as JSON for display on details views.</summary>
+    public string? FormulaFieldValuesJson { get; set; }
+
     // Relationships
     public virtual Job Job { get; set; } = null!;
     public virtual CatalogItem? CatalogItem { get; set; }

src/PowderCoating.Core/Entities/QuoteItem.cs

@@ -56,6 +56,14 @@ public class QuoteItem : BaseEntity
     public int? AiPredictionId { get; set; }
     public virtual AiItemPrediction? AiPrediction { get; set; }
 
+    // Custom formula item — see IsCustomFormulaItem routing in PricingCalculationService
+    public bool IsCustomFormulaItem { get; set; }
+    public int? CustomItemTemplateId { get; set; }
+    public virtual CustomItemTemplate? CustomItemTemplate { get; set; }
+
+    /// <summary>Snapshot of field name/value pairs used in the formula, stored as JSON for display on details views.</summary>
+    public string? FormulaFieldValuesJson { get; set; }
+
     // Relationships
     public virtual Quote Quote { get; set; } = null!;
     public virtual CatalogItem? CatalogItem { get; set; }