Add QuoteApprovedByCustomer notification type; fix wrong type logged on approval

QuoteDeclinedByCustomer was used for both approve and decline responses,
so approval notifications showed the wrong type in the log. Added a distinct
QuoteApprovedByCustomer = 16 enum value, wired up the correct type in
NotificationService, added default templates in both the service fallback
dictionary and SeedData, and updated placeholder hints in CompanySettings.

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

src/PowderCoating.Infrastructure/Data/SeedData.cs

@@ -977,6 +977,28 @@ New accounts walk through an 18-step setup wizard to configure company informati
                 CompanyId = companyId,
                 CreatedAt = DateTime.UtcNow
             },
+            new NotificationTemplate
+            {
+                NotificationType = NotificationType.QuoteApprovedByCustomer,
+                Channel = NotificationChannel.Email,
+                DisplayName = "Quote Approved by Customer (Internal)",
+                Subject = "Customer Response: Quote {{quoteNumber}} — {{companyName}}",
+                Body = "<p>Hello,</p><p>A customer has responded to quote <strong>{{quoteNumber}}</strong>.</p><p><strong>Customer:</strong> {{customerName}}<br/><strong>Response:</strong> {{response}}</p><p>Log in to the portal to review and follow up.</p>",
+                IsActive = true,
+                CompanyId = companyId,
+                CreatedAt = DateTime.UtcNow
+            },
+            new NotificationTemplate
+            {
+                NotificationType = NotificationType.QuoteDeclinedByCustomer,
+                Channel = NotificationChannel.Email,
+                DisplayName = "Quote Declined by Customer (Internal)",
+                Subject = "Customer Response: Quote {{quoteNumber}} — {{companyName}}",
+                Body = "<p>Hello,</p><p>A customer has responded to quote <strong>{{quoteNumber}}</strong>.</p><p><strong>Customer:</strong> {{customerName}}<br/><strong>Response:</strong> {{response}}</p>{{declineReasonSection}}<p>Log in to the portal to review and follow up.</p>",
+                IsActive = true,
+                CompanyId = companyId,
+                CreatedAt = DateTime.UtcNow
+            },
         ];
     }
 

src/PowderCoating.Infrastructure/Services/NotificationService.cs

@@ -900,8 +900,12 @@ public class NotificationService : INotificationService
                 ? $"Quote {quote.QuoteNumber} APPROVED — {customerName}"
                 : $"Quote {quote.QuoteNumber} DECLINED — {customerName}";
 
+            var notificationType = approved
+                ? NotificationType.QuoteApprovedByCustomer
+                : NotificationType.QuoteDeclinedByCustomer;
+
             var (subject, htmlBody) = await GetRenderedEmailAsync(
-                quote.CompanyId, NotificationType.QuoteDeclinedByCustomer, values, defaultSubject);
+                quote.CompanyId, notificationType, values, defaultSubject);
 
             var fullHtml = AppendUnsubscribeFooterHtml(htmlBody, token: null, company, await GetBaseUrlAsync());
             var plainText = StripHtml(fullHtml);
@@ -913,7 +917,7 @@ public class NotificationService : INotificationService
             await WriteLog(new NotificationLog
             {
                 Channel = NotificationChannel.Email,
-                NotificationType = NotificationType.QuoteDeclinedByCustomer,
+                NotificationType = notificationType,
                 Status = success ? NotificationStatus.Sent : NotificationStatus.Failed,
                 RecipientName = companyName,
                 Recipient = companyEmail,
@@ -1133,6 +1137,10 @@ public class NotificationService : INotificationService
                     "Payment Received — Invoice {{invoiceNumber}}",
                     "<p>Dear {{customerName}},</p><p>We have received your payment of <strong>{{paymentAmount}}</strong> on {{paymentDate}} for invoice <strong>{{invoiceNumber}}</strong>.{{balanceDue}}</p><p>Thank you for your business with {{companyName}}.</p>"
                 ),
+                [(NotificationType.QuoteApprovedByCustomer, NotificationChannel.Email)] = (
+                    "Customer Response: Quote {{quoteNumber}} — {{companyName}}",
+                    "<p>Hello,</p><p>A customer has responded to quote <strong>{{quoteNumber}}</strong>.</p><p><strong>Customer:</strong> {{customerName}}<br/><strong>Response:</strong> {{response}}</p><p>Log in to the portal to review and follow up.</p>"
+                ),
                 [(NotificationType.QuoteDeclinedByCustomer, NotificationChannel.Email)] = (
                     "Customer Response: Quote {{quoteNumber}} — {{companyName}}",
                     "<p>Hello,</p><p>A customer has responded to quote <strong>{{quoteNumber}}</strong>.</p><p><strong>Customer:</strong> {{customerName}}<br/><strong>Response:</strong> {{response}}</p>{{declineReasonSection}}<p>Log in to the portal to review and follow up.</p>"