Add three-layer feature gating for AI Catalog Price Check

Adds platform-level, plan-level (Enterprise only), and per-company
toggles for the AI Catalog Price Check feature. Includes:
- Company.AiCatalogPriceCheckEnabled per-company flag
- SubscriptionPlanConfig.AllowAiCatalogPriceCheck plan-level flag
- PlatformSetting 'AiCatalogPriceCheckEnabled' global kill switch
- IPlatformSettingsService.GetBoolAsync helper
- ISubscriptionService.CanUseAiCatalogPriceCheckAsync
- UI controls in Companies/Edit, PlatformSubscription/Edit+Index,
  and SubscriptionManagement/Manage
- Migration AddAiCatalogPriceCheckGating applied

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

src/PowderCoating.Web/Controllers/CatalogItemsController.cs

@@ -39,6 +39,7 @@ namespace PowderCoating.Web.Controllers
         private readonly ISubscriptionService _subscriptionService;
         private readonly ICatalogImageService _catalogImageService;
         private readonly IAiCatalogPriceCheckService _priceCheckService;
+        private readonly IPlatformSettingsService _platformSettings;
 
         public CatalogItemsController(
             IUnitOfWork unitOfWork,
@@ -50,7 +51,8 @@ namespace PowderCoating.Web.Controllers
             IMeasurementConversionService measurementService,
             ISubscriptionService subscriptionService,
             ICatalogImageService catalogImageService,
-            IAiCatalogPriceCheckService priceCheckService)
+            IAiCatalogPriceCheckService priceCheckService,
+            IPlatformSettingsService platformSettings)
         {
             _unitOfWork = unitOfWork;
             _mapper = mapper;
@@ -62,6 +64,7 @@ namespace PowderCoating.Web.Controllers
             _subscriptionService = subscriptionService;
             _catalogImageService = catalogImageService;
             _priceCheckService = priceCheckService;
+            _platformSettings = platformSettings;
         }
 
         /// <summary>
@@ -934,6 +937,11 @@ namespace PowderCoating.Web.Controllers
             var currentUser = await _userManager.GetUserAsync(User);
             if (currentUser == null) return Forbid();
 
+            // Three-layer gate: platform setting → plan (Enterprise) → per-company toggle
+            var platformEnabled = await _platformSettings.GetBoolAsync(PlatformSettingKeys.AiCatalogPriceCheckEnabled, true);
+            var companyEnabled = platformEnabled && await _subscriptionService.CanUseAiCatalogPriceCheckAsync(currentUser.CompanyId);
+            ViewBag.AiPriceCheckEnabled = companyEnabled;
+
             var existing = await _unitOfWork.CatalogPriceCheckReports.FindAsync(
                 r => r.CompanyId == currentUser.CompanyId);
             var report = existing.OrderByDescending(r => r.RunAt).FirstOrDefault();
@@ -995,6 +1003,14 @@ namespace PowderCoating.Web.Controllers
             var currentUser = await _userManager.GetUserAsync(User);
             if (currentUser == null) return Forbid();
 
+            // Three-layer gate: platform setting → plan → per-company toggle
+            var platformEnabled = await _platformSettings.GetBoolAsync(PlatformSettingKeys.AiCatalogPriceCheckEnabled, true);
+            if (!platformEnabled || !await _subscriptionService.CanUseAiCatalogPriceCheckAsync(currentUser.CompanyId))
+            {
+                TempData["Error"] = "AI Catalog Price Check is not available on your current plan.";
+                return RedirectToAction(nameof(AiPriceCheck));
+            }
+
             // Enforce quarterly run limit — check the most recent report for this company.
             var lastReport = (await _unitOfWork.CatalogPriceCheckReports.FindAsync(
                 r => r.CompanyId == currentUser.CompanyId))

src/PowderCoating.Web/Controllers/PlatformSubscriptionController.cs

@@ -63,6 +63,7 @@ public class PlatformSubscriptionController : Controller
             AllowAccounting = c.AllowAccounting,
             AllowAiPhotoQuotes = c.AllowAiPhotoQuotes,
             AllowAiInventoryAssist = c.AllowAiInventoryAssist,
+            AllowAiCatalogPriceCheck = c.AllowAiCatalogPriceCheck,
             IsActive = c.IsActive,
             SortOrder = c.SortOrder
         }).ToList();
@@ -102,6 +103,7 @@ public class PlatformSubscriptionController : Controller
             AllowAccounting = config.AllowAccounting,
             AllowAiPhotoQuotes = config.AllowAiPhotoQuotes,
             AllowAiInventoryAssist = config.AllowAiInventoryAssist,
+            AllowAiCatalogPriceCheck = config.AllowAiCatalogPriceCheck,
             IsActive = config.IsActive
         };
 
@@ -146,6 +148,7 @@ public class PlatformSubscriptionController : Controller
         config.AllowAccounting = dto.AllowAccounting;
         config.AllowAiPhotoQuotes = dto.AllowAiPhotoQuotes;
         config.AllowAiInventoryAssist = dto.AllowAiInventoryAssist;
+        config.AllowAiCatalogPriceCheck = dto.AllowAiCatalogPriceCheck;
         config.IsActive = dto.IsActive;
 
         await _unitOfWork.SubscriptionPlanConfigs.UpdateAsync(config);

src/PowderCoating.Web/Controllers/SubscriptionManagementController.cs

@@ -462,12 +462,14 @@ public class SubscriptionManagementController : Controller
     /// <param name="id">Primary key of the company to update.</param>
     /// <param name="aiPhotoQuotesEnabled">Whether AI photo quoting is enabled for this company.</param>
     /// <param name="aiInventoryAssistEnabled">Whether AI inventory assistance is enabled for this company.</param>
+    /// <param name="aiCatalogPriceCheckEnabled">Whether AI catalog price check is enabled for this company.</param>
     /// <param name="maxAiPhotoQuotesPerMonthOverride">Monthly AI photo quote limit override; 0 = plan default.</param>
     [HttpPost, ValidateAntiForgeryToken]
     public async Task<IActionResult> UpdateFeatureFlags(
         int id,
         bool aiPhotoQuotesEnabled,
         bool aiInventoryAssistEnabled,
+        bool aiCatalogPriceCheckEnabled,
         int? maxAiPhotoQuotesPerMonthOverride)
     {
         var company = await _db.Companies.IgnoreQueryFilters().FirstOrDefaultAsync(c => c.Id == id);
@@ -475,6 +477,7 @@ public class SubscriptionManagementController : Controller
 
         company.AiPhotoQuotesEnabled = aiPhotoQuotesEnabled;
         company.AiInventoryAssistEnabled = aiInventoryAssistEnabled;
+        company.AiCatalogPriceCheckEnabled = aiCatalogPriceCheckEnabled;
         company.MaxAiPhotoQuotesPerMonthOverride = NullIfZero(maxAiPhotoQuotesPerMonthOverride);
         company.UpdatedAt = DateTime.UtcNow;
         company.UpdatedBy = User.Identity?.Name;