Fix pricing consistency across Quote → Job → Invoice; add stage-flow tests

- Store complete PricingBreakdownJson snapshot on Job at every save point so
  the Details page reads stored data rather than re-running the pricing engine
- Add 7 missing fields to Quote entity (FacilityOverheadCost, tier/quote discounts,
  SubtotalAfterDiscount) and persist them via ApplyPricingSnapshot
- Fix OvenCostId-as-rate bug in JobsController (FK was passed as decimal $/hr)
- Fix hardcoded LaborCost * 0.4 multiplier in two JobItemAssemblyService overloads
- Fix FacilityOverheadCost dropped from invoices in both quote and direct-job paths
- Fix RushFee missing from direct-job invoices (read from PricingBreakdownJson)
- Fix Notes and CatalogItemId not copied to InvoiceItem
- Add 14 unit tests in PricingStageFlowTests covering all three pricing stages

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/PowderCoating.Core/Entities/Job.cs

@@ -66,6 +66,10 @@ public class Job : BaseEntity
     // Used to detect when the quote was subsequently edited so the job details page can warn the user.
     public DateTime? QuoteSnapshotUpdatedAt { get; set; }
 
+    // Pricing snapshot — serialized QuotePricingBreakdownDto stored at save time so Details displays
+    // the breakdown that was actually calculated, not a re-run against current operating costs.
+    public string? PricingBreakdownJson { get; set; }
+
     // Rework tracking
     public bool IsReworkJob { get; set; }
     public int? OriginalJobId { get; set; }       // Set when this job was created as a rework

src/PowderCoating.Core/Entities/Quote.cs

@@ -40,26 +40,33 @@ public class Quote : BaseEntity
     public DateTime? ApprovedDate { get; set; }
     
     // Pricing — all values are snapshots captured at save time and must not be recalculated on load
-    public decimal MaterialCosts { get; set; }       // Sum of powder/material costs across all items
-    public decimal LaborCosts { get; set; }          // Sum of labor costs across all items
-    public decimal EquipmentCosts { get; set; }      // Sum of equipment costs across all items
-    public decimal ItemsSubtotal { get; set; }       // Sum of item prices before any quote-level costs
-    public decimal OvenBatchCost { get; set; }       // Oven batch charge applied at quote level
-    public decimal ShopSuppliesAmount { get; set; }  // Shop supplies dollar amount
-    public decimal ShopSuppliesPercent { get; set; } // Shop supplies percentage used
-    public decimal OverheadAmount { get; set; }      // Overhead dollar amount
-    public decimal OverheadPercent { get; set; }     // Overhead percentage used
-    public decimal ProfitMargin { get; set; }        // Profit margin dollar amount
-    public decimal ProfitPercent { get; set; }       // Profit margin percentage used
-    public decimal SubTotal { get; set; }            // SubtotalBeforeDiscount (items + oven + overhead + profit + shop supplies)
+    public decimal MaterialCosts { get; set; }              // Sum of powder/material costs across all items
+    public decimal LaborCosts { get; set; }                 // Sum of labor costs across all items
+    public decimal EquipmentCosts { get; set; }             // Sum of equipment costs across all items
+    public decimal ItemsSubtotal { get; set; }              // Sum of item prices before any quote-level costs
+    public decimal OvenBatchCost { get; set; }              // Oven batch charge applied at quote level
+    public decimal FacilityOverheadCost { get; set; }       // Rent + utilities apportioned by estimated job hours
+    public decimal FacilityOverheadRatePerHour { get; set; }// Rate used for facility overhead ($/hr)
+    public decimal ShopSuppliesAmount { get; set; }         // Shop supplies dollar amount
+    public decimal ShopSuppliesPercent { get; set; }        // Shop supplies percentage used
+    public decimal OverheadAmount { get; set; }             // Legacy overhead (now always 0; kept for migration safety)
+    public decimal OverheadPercent { get; set; }            // Legacy overhead percent
+    public decimal ProfitMargin { get; set; }               // Profit margin dollar amount (0 — baked into item prices)
+    public decimal ProfitPercent { get; set; }              // Markup % used (for display reference)
+    public decimal SubTotal { get; set; }                   // SubtotalBeforeDiscount (items + oven + facility overhead + shop supplies)
 
     // Discount Information
     public DiscountType DiscountType { get; set; } = DiscountType.None;
-    public decimal DiscountValue { get; set; } = 0; // Value entered by user (percentage or fixed amount)
-    public decimal DiscountPercent { get; set; } // Calculated: actual percentage applied
-    public decimal DiscountAmount { get; set; } // Calculated: actual dollar amount deducted
-    public string? DiscountReason { get; set; } // Why discount was applied
+    public decimal DiscountValue { get; set; } = 0;          // Value entered by user (percentage or fixed amount)
+    public decimal PricingTierDiscountAmount { get; set; }   // Discount from customer's pricing tier
+    public decimal PricingTierDiscountPercent { get; set; }  // Tier discount percentage
+    public decimal QuoteDiscountAmount { get; set; }         // Manual quote-level discount amount
+    public decimal QuoteDiscountPercent { get; set; }        // Manual quote-level discount percentage
+    public decimal DiscountPercent { get; set; }             // Combined: actual percentage applied
+    public decimal DiscountAmount { get; set; }              // Combined: actual dollar amount deducted
+    public string? DiscountReason { get; set; }              // Why discount was applied
     public bool HideDiscountFromCustomer { get; set; } = false; // Show only total on PDFs/portal
+    public decimal SubtotalAfterDiscount { get; set; }       // SubTotal minus all discounts, before rush/tax
 
     public decimal TaxPercent { get; set; }
     public decimal TaxAmount { get; set; }