Change URL scheme fallback from https to http

Manufacturer product pages are often not on secure connections; http:// is the
safer default to avoid connection failures on non-SSL sites.

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

src/PowderCoating.Web/wwwroot/js/inventory-catalog-lookup.js

@@ -415,7 +415,7 @@
 
     function ensureAbsoluteUrl(url) {
         if (!url) return url;
-        return /^https?:\/\//i.test(url) ? url : 'https://' + url;
+        return /^https?:\/\//i.test(url) ? url : 'http://' + url;
     }
 
     function syncLinkButton(inputId, linkId, url) {