feat: extract shop from mp/shop — initial libreshop/shop

Source moved verbatim from mp/shop/ on 2026-04-29; mp was the first
concrete adapter consuming the libreshop toolkit. Builds and publishes
git.librete.ch/libreshop/shop on every main / v* push via the standard
.gitea/workflows/build.yml shared across libreshop components.

plugins/umami.client.ts

@@ -0,0 +1,15 @@
+export default defineNuxtPlugin(() => {
+	const config = useRuntimeConfig();
+
+	if (config.public.umamiScriptUrl && config.public.umamiWebsiteId) {
+		useHead({
+			script: [
+				{
+					src: config.public.umamiScriptUrl,
+					defer: true,
+					"data-website-id": config.public.umamiWebsiteId
+				}
+			]
+		});
+	}
+});