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.

pages/zahlung.vue

@@ -0,0 +1,68 @@
+<template>
+	<main class="pb-20">
+		<PageHero title="Zahlung" subtitle="Sichere Zahlungsmöglichkeiten für Ihren Einkauf" />
+
+		<!-- Dynamic Payment Methods from API -->
+		<section class="py-12 lg:py-16">
+			<div class="xl:container mx-auto px-6">
+				<div v-if="pending" class="text-center py-8">
+					<LoadingSpinner />
+				</div>
+
+				<div v-else-if="paymentMethods.length > 0" class="grid md:grid-cols-2 gap-8">
+					<div v-for="method in paymentMethods" :key="method.id" class="bg-gray-50 rounded-xl p-6">
+						<div class="flex justify-between items-start mb-3">
+							<h2 class="text-xl font-semibold">{{ method.name }}</h2>
+							<span v-if="method.price > 0" class="text-sm text-gray-500 bg-white px-2 py-1 rounded">+ {{ formatPrice(method.price) }}</span>
+						</div>
+						<p v-if="method.description" class="text-gray-600 leading-relaxed">{{ method.description }}</p>
+					</div>
+				</div>
+			</div>
+		</section>
+
+		<!-- Security Note -->
+		<section class="py-12 lg:py-16 bg-gray-50">
+			<div class="xl:container mx-auto px-6">
+				<div class="max-w-2xl mx-auto text-center">
+					<div class="inline-flex items-center justify-center w-16 h-16 rounded-full bg-white mb-6">
+						<svg class="w-8 h-8 text-gray-700" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+							<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 15v2m-6 4h12a2 2 0 002-2v-6a2 2 0 00-2-2H6a2 2 0 00-2 2v6a2 2 0 002 2zm10-10V7a4 4 0 00-8 0v4h8z" />
+						</svg>
+					</div>
+					<h2 class="text-2xl font-bold mb-4">Sicher bezahlen</h2>
+					<p class="text-gray-600">Alle Zahlungen werden über verschlüsselte Verbindungen abgewickelt. Ihre Daten sind bei uns sicher.</p>
+				</div>
+			</div>
+		</section>
+	</main>
+</template>
+
+<script setup lang="ts">
+import { numberFormatter } from "~/utils/numberFormatter";
+
+const shopApi = useShopApi();
+
+const { data: paymentData, status } = await useAsyncData("payment-methods", async () => {
+	const response = await shopApi.getPaymentMethods();
+	// Flatten Strapi v4 attributes structure
+	return (response.data || []).map((item: any) => ({
+		id: item.id,
+		name: item.attributes?.name ?? item.name,
+		price: item.attributes?.price ?? item.price ?? 0,
+		description: item.attributes?.description ?? item.description
+	}));
+});
+
+const pending = computed(() => status.value === "pending");
+const paymentMethods = computed(() => paymentData.value || []);
+
+function formatPrice(price: number) {
+	return numberFormatter(price, "EUR");
+}
+
+useSeoMeta({
+	title: "Zahlung | MUELLERPRINTS",
+	description: "Zahlungsmöglichkeiten bei MUELLERPRINTS: PayPal, Kreditkarte, Lastschrift, Barzahlung. Sichere und bequeme Bezahlung."
+});
+</script>