Add AI Catalog Price Check feature

Claude reviews every active catalog item against the shop's own operating costs
and returns a per-item verdict (below-cost / thin-margin / high / ok) with a
suggested price range, cost floor, and assumptions.

- New entity: CatalogPriceCheckReport (JSON blob, archived per company)
- New service: IAiCatalogPriceCheckService / AiCatalogPriceCheckService
  batches items 25 at a time to stay within model context limits
- Two new controller actions: GET AiPriceCheck (view report) + POST RunAiPriceCheck
- AiPriceCheck view: summary cards (counts by verdict), color-coded item cards
  with Edit Price link, assumptions detail, and loading spinner on submit
- AI Price Check button added to catalog Index header
- Migration AddCatalogPriceCheckReport applied

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

src/PowderCoating.Application/DTOs/AI/CatalogPriceCheckDtos.cs

@@ -0,0 +1,80 @@
+namespace PowderCoating.Application.DTOs.AI;
+
+// ── Input ─────────────────────────────────────────────────────────────────────
+
+/// <summary>Lightweight representation of a catalog item sent to Claude for analysis.</summary>
+public class CatalogItemForPriceCheck
+{
+    public int Id { get; set; }
+    public string Name { get; set; } = string.Empty;
+    public string? Description { get; set; }
+    public string CategoryName { get; set; } = string.Empty;
+    public decimal CurrentPrice { get; set; }
+    public decimal? ApproximateAreaSqFt { get; set; }
+    public int? EstimatedMinutes { get; set; }
+    public bool RequiresSandblasting { get; set; }
+    public bool RequiresMasking { get; set; }
+}
+
+/// <summary>Operating cost summary injected into the Claude system prompt.</summary>
+public class ShopOperatingCostSummary
+{
+    public decimal LaborRatePerHour { get; set; }
+    public decimal OvenCostPerHour { get; set; }
+    public decimal SandblasterCostPerHour { get; set; }
+    public decimal CoatingBoothCostPerHour { get; set; }
+    public decimal PowderCostPerSqFt { get; set; }
+    public decimal ShopSuppliesRatePercent { get; set; }
+    public decimal MarkupOrMarginPercent { get; set; }
+    public string PricingMode { get; set; } = "markup"; // "markup" or "margin"
+    public decimal ShopMinimumCharge { get; set; }
+    public string? AiContextProfile { get; set; }
+}
+
+// ── Per-Item Result ───────────────────────────────────────────────────────────
+
+/// <summary>Verdict on a single catalog item's price health.</summary>
+public class CatalogItemPriceVerdict
+{
+    public int CatalogItemId { get; set; }
+    public string Name { get; set; } = string.Empty;
+    public decimal CurrentPrice { get; set; }
+
+    /// <summary>Assumptions Claude made about size/complexity to estimate costs.</summary>
+    public string Assumptions { get; set; } = string.Empty;
+
+    public decimal EstimatedSqFtMin { get; set; }
+    public decimal EstimatedSqFtMax { get; set; }
+    public int EstimatedMinutesMin { get; set; }
+    public int EstimatedMinutesMax { get; set; }
+
+    /// <summary>Calculated cost floor using the shop's own rates.</summary>
+    public decimal CostFloor { get; set; }
+
+    /// <summary>ok | low | high | below-cost</summary>
+    public string Verdict { get; set; } = "ok";
+
+    public decimal SuggestedPriceMin { get; set; }
+    public decimal SuggestedPriceMax { get; set; }
+
+    /// <summary>high | medium | low</summary>
+    public string Confidence { get; set; } = "medium";
+
+    public string Reasoning { get; set; } = string.Empty;
+}
+
+// ── Report ────────────────────────────────────────────────────────────────────
+
+public class CatalogPriceCheckReportDto
+{
+    public int Id { get; set; }
+    public DateTime RunAt { get; set; }
+    public int ItemsChecked { get; set; }
+    public int BelowCostCount { get; set; }
+    public int LowMarginCount { get; set; }
+    public int HighPriceCount { get; set; }
+    public int OkCount { get; set; }
+    public List<CatalogItemPriceVerdict> Results { get; set; } = new();
+    public string OperatingCostsSummary { get; set; } = string.Empty;
+}
+

src/PowderCoating.Application/Interfaces/IAiCatalogPriceCheckService.cs

@@ -0,0 +1,16 @@
+using PowderCoating.Application.DTOs.AI;
+
+namespace PowderCoating.Application.Interfaces;
+
+public interface IAiCatalogPriceCheckService
+{
+    /// <summary>
+    /// Analyzes the provided catalog items against the shop's operating costs and returns
+    /// a verdict for each item. Items are batched into groups of 25 to stay within Claude's
+    /// context limits. Returns null results for any item that could not be analyzed.
+    /// </summary>
+    Task<List<CatalogItemPriceVerdict>> AnalyzeAsync(
+        List<CatalogItemForPriceCheck> items,
+        ShopOperatingCostSummary costs,
+        CancellationToken cancellationToken = default);
+}