Lazily enrich catalog specs from TDS on first use

Specific gravity, coverage, and ~55% of cure specs aren't in the Columbia feed.
Rather than read 2,400 TDS PDFs up front, enrich a catalog item the first time
it's actually used:

- FetchTdsCureSpecsAsync now also extracts specific gravity from the TDS.
- New EnsureCatalogTdsSpecsAsync fills a catalog item's specific gravity (and
  any missing cure temp/time) from its TDS, then derives theoretical coverage
  (192.3 / (SG x mils)). No-op once specific gravity is known or when there's no
  TDS; persists to the catalog so the work is done once and benefits everyone.
- Hooked into the catalog->inventory paths (CreateIncomingFromCatalog, the
  custom-powder receive enrichment, and ReceivePowderFromCatalog) so a powder's
  full specs land on both the catalog and the new inventory record. DashboardController
  gains the AI lookup service for this.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/PowderCoating.Web/Controllers/DashboardController.cs

@@ -25,6 +25,7 @@ public class DashboardController : Controller
     private readonly ICompanyConfigHealthService _configHealth;
     private readonly UserManager<ApplicationUser> _userManager;
     private readonly ISubscriptionService _subscriptionService;
+    private readonly IInventoryAiLookupService _aiLookupService;
 
     public DashboardController(
         IUnitOfWork unitOfWork,
@@ -33,7 +34,8 @@ public class DashboardController : Controller
         ITenantContext tenantContext,
         ICompanyConfigHealthService configHealth,
         UserManager<ApplicationUser> userManager,
-        ISubscriptionService subscriptionService)
+        ISubscriptionService subscriptionService,
+        IInventoryAiLookupService aiLookupService)
     {
         _unitOfWork = unitOfWork;
         _logger = logger;
@@ -42,6 +44,7 @@ public class DashboardController : Controller
         _configHealth = configHealth;
         _userManager = userManager;
         _subscriptionService = subscriptionService;
+        _aiLookupService = aiLookupService;
     }
 
     /// <summary>
@@ -868,8 +871,12 @@ public class DashboardController : Controller
         InventoryItem item, string? colorCode, string? colorName, string? manufacturer)
     {
         var catalog = await FindCatalogByIdentityAsync(colorCode, colorName, manufacturer);
-        if (catalog != null)
-            ApplyCatalogToInventory(item, catalog);
+        if (catalog == null)
+            return;
+
+        // First use — lazily fill specific gravity / cure from the TDS before copying onto the item.
+        await _aiLookupService.EnsureCatalogTdsSpecsAsync(catalog);
+        ApplyCatalogToInventory(item, catalog);
     }
 
     /// <summary>
@@ -987,6 +994,9 @@ public class DashboardController : Controller
             if (catalog == null)
                 return Json(new { success = false, needsDetails = true });
 
+            // First use — lazily fill specific gravity / cure from the TDS so the new record is complete.
+            await _aiLookupService.EnsureCatalogTdsSpecsAsync(catalog);
+
             // Resolve the company's POWDER (coating) inventory category.
             var categories = await _unitOfWork.InventoryCategoryLookups.FindAsync(c => c.CompanyId == companyId);
             var coatingCategory = categories.FirstOrDefault(c => c.IsActive && c.IsCoating

src/PowderCoating.Web/Controllers/InventoryController.cs

@@ -1263,6 +1263,10 @@ public class InventoryController : Controller
             if (catalogItem == null)
                 return Json(new { success = false, error = "Catalog item not found." });
 
+            // First use of this powder — lazily fill specific gravity / cure from its TDS so the new
+            // inventory record (and the catalog) carry complete specs. No-op once already enriched.
+            await _aiLookupService.EnsureCatalogTdsSpecsAsync(catalogItem);
+
             var companyId = _tenantContext.GetCurrentCompanyId() ?? 0;
 
             // Find the default coating category to assign.