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/products/[id]/variants.get.ts

@@ -0,0 +1,10 @@
+import { fetchCms } from "~/server/utils/cmsApi";
+
+export default defineEventHandler(async (event) => {
+	const id = getRouterParam(event, "id");
+	if (!id) {
+		throw createError({ statusCode: 400, statusMessage: "Missing product ID" });
+	}
+
+	return await fetchCms(`/products/${id}/variants`);
+});

server/api/products/[id]/variants/pattern.get.ts

@@ -0,0 +1,10 @@
+import { fetchCms } from "~/server/utils/cmsApi";
+
+export default defineEventHandler(async (event) => {
+	const id = getRouterParam(event, "id");
+	if (!id) {
+		throw createError({ statusCode: 400, statusMessage: "Missing product ID" });
+	}
+
+	return await fetchCms(`/products/${id}/variants/pattern`);
+});

server/api/products/index.get.ts

@@ -0,0 +1,12 @@
+import { fetchCms } from "~/server/utils/cmsApi";
+
+export default defineEventHandler(async (event) => {
+	const query = getQuery(event);
+
+	const params = new URLSearchParams();
+	if (query.cover) params.append("filters[cover]", String(query.cover));
+	params.append("pagination[page]", String(query.page || 1));
+	params.append("pagination[pageSize]", String(query.pageSize || 24));
+
+	return await fetchCms(`/products?${params}`);
+});

server/api/products/promo.get.ts

@@ -0,0 +1,21 @@
+import { fetchCms } from "~/server/utils/cmsApi";
+import { resolveCoverId } from "~/server/utils/coverSlug";
+
+export default defineEventHandler(async (event) => {
+	const query = getQuery(event);
+
+	const params = new URLSearchParams();
+
+	// Resolve cover slug to ID if provided
+	if (query.cover) {
+		const coverId = await resolveCoverId(String(query.cover));
+		if (coverId) {
+			params.append("filters[cover]", coverId);
+		}
+	}
+
+	params.append("pagination[page]", String(query.page || 1));
+	params.append("pagination[pageSize]", String(query.pageSize || 24));
+
+	return await fetchCms(`/promo-products?${params}`);
+});