Fix CloudFront routing and TypeScript type safety

- Update CloudFront Function to handle Next.js static export .html files
- Fix TypeScript interface for color request service (add required user_phone field)
- Update ColorRequestForm component to include phone field

terraform/cloudfront-function.js

@@ -8,8 +8,9 @@ function handler(event) {
         if (uri.endsWith('/')) {
             request.uri += 'index.html';
         } else {
-            // Add /index.html to directory paths
-            request.uri += '/index.html';
+            // For Next.js static export, try .html first
+            // CloudFront will handle 404s via custom error response
+            request.uri += '.html';
         }
     }