fix(brochure): use dynamic base URL and resolve singular/plural routing conflict

next.config.mjs

@@ -435,16 +435,16 @@ const nextConfig = {
           destination: '/api/datasheets/:path*',
         },
         {
-          source: '/:locale/brochures/:path*',
-          destination: '/api/brochures/:path*',
+          source: '/:locale/brochure/:path*',
+          destination: '/brochure/:path*',
         },
         {
           source: '/datasheets/:path*',
           destination: '/api/datasheets/:path*',
         },
         {
-          source: '/brochures/:path*',
-          destination: '/api/brochures/:path*',
+          source: '/brochure/:path*',
+          destination: '/brochure/:path*',
         },
         {
           source: '/de/produkte',