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.

server/api/orders/index.post.ts

@@ -0,0 +1,5 @@
+import { fetchCms } from "~/server/utils/cmsApi";
+
+export default defineEventHandler(async () => {
+	return await fetchCms(`/orders/`, { method: "POST" });
+});