Fix virtual pages with routes using Page::factory()

Replace page.children:after hook with proper routes implementation.
Product pages are now created dynamically via routes that match
Shopify handles for both French and English versions.

Changes:
- Add routes with Page::factory() for virtual product pages
- Remove hooks approach (not working)
- Clean up old Snipcart webhook routes
- Support FR and EN product URLs

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.claude/settings.local.json

@@ -8,7 +8,9 @@
       "Bash(curl:*)",
       "WebFetch(domain:snipcart.com)",
       "Bash(grep:*)",
-      "Bash(npm run build:*)"
+      "Bash(npm run build:*)",
+      "Bash(php test-shopify.php:*)",
+      "WebFetch(domain:getkirby.com)"
     ]
   }
 }