Add oven batch cost to AI Quick Quote (1 batch, DefaultOvenCycleMinutes or 50 min)

Previously the quick quote omitted the oven charge entirely, so saved quotes
were under-priced relative to full quotes from the same items.

Pricing: CalculatePricing now calculates ovenBatchCost = (cycleMin/60) × OvenOperatingCostPerHour
using DefaultOvenCycleMinutes (fallback 50 min), then adds it to the total as a quote-level
charge matching how PricingCalculationService handles oven costs.

Save path: SaveQuickQuoteRequest gains OvenBatchCost + OvenCycleMinutes; the Quote record
now stores OvenBatchCost, OvenCycleMinutes, and Total = ItemsSubtotal + OvenBatchCost.

Display: results card shows a sub-line under the estimate price:
"incl. oven 1 batch 50 min: $12.00"

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

src/PowderCoating.Web/wwwroot/js/ai-quick-quote.js

@@ -29,6 +29,7 @@
         resComplexity:document.getElementById('qq-res-complexity'),
         resMinutes:   document.getElementById('qq-res-minutes'),
         resPrice:     document.getElementById('qq-res-price'),
+        resOven:      document.getElementById('qq-res-oven'),
         resConfidence:document.getElementById('qq-res-confidence'),
         resReasoning: document.getElementById('qq-res-reasoning'),
         powderSection:document.getElementById('qq-powder-section'),
@@ -150,6 +151,15 @@
         el.resComplexity.textContent = r.complexity || '—';
         el.resMinutes.textContent = r.estimatedMinutes ? r.estimatedMinutes + ' min' : '—';
         el.resPrice.textContent = formatCurrency(r.estimatedTotal || r.estimatedUnitPrice);
+
+        const ovenCost = r.breakdown?.ovenCost;
+        const ovenMin  = r.breakdown?.ovenCycleMinutes;
+        if (ovenCost && ovenCost > 0) {
+            el.resOven.textContent = `incl. oven 1 batch ${ovenMin ? ovenMin + ' min' : ''}: ${formatCurrency(ovenCost)}`;
+        } else {
+            el.resOven.textContent = '';
+        }
+
         el.resReasoning.textContent = r.reasoning || '';
 
         // Confidence badge
@@ -220,7 +230,9 @@
                 coatCount:           parseInt(el.coats.value, 10) || 1,
                 estimatedUnitPrice:  lastResult.estimatedUnitPrice,
                 materialCost:        lastResult.breakdown?.materialCost ?? 0,
-                laborCost:           lastResult.breakdown?.laborCost ?? 0
+                laborCost:           lastResult.breakdown?.laborCost ?? 0,
+                ovenBatchCost:       lastResult.breakdown?.ovenCost ?? 0,
+                ovenCycleMinutes:    lastResult.breakdown?.ovenCycleMinutes ?? 50
             };
 
             const response = await post('/AiQuickQuote/Save', body);