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/health.get.ts

@@ -0,0 +1,26 @@
+export default defineEventHandler(async (event) => {
+	const config = useRuntimeConfig();
+	const healthStatus: Record<string, unknown> = { status: "ok" };
+
+	// Check CMS connectivity (CMS returns 204 No Content for /_health)
+	try {
+		const cmsUrl = config.cmsInternalUrl || "http://cms:5555";
+		await $fetch(`${cmsUrl}/_health`, {
+			timeout: 5000,
+			ignoreResponseError: false
+		});
+		// If we get here without error, CMS is responding (even with 204)
+		healthStatus.cms_responding = true;
+	} catch (error) {
+		healthStatus.cms_responding = false;
+		healthStatus.status = "degraded";
+	}
+
+	// Check if API token is configured
+	healthStatus.api_token_configured = !!config.shopApiToken;
+
+	const statusCode = healthStatus.status === "ok" ? 200 : 503;
+	setResponseStatus(event, statusCode);
+
+	return healthStatus;
+});