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/Views/Inventory/Details.cshtml

@@ -9,7 +9,7 @@
     string SafeUrl(string? url) =>
         string.IsNullOrEmpty(url) ? "#"
         : (url.StartsWith("http://", StringComparison.OrdinalIgnoreCase) || url.StartsWith("https://", StringComparison.OrdinalIgnoreCase))
-            ? url : "https://" + url;
+            ? url : "http://" + url;
 }
 
 @section Styles {