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.

components/ProductCarousel.vue

@@ -0,0 +1,29 @@
+<template>
+	<Carousel
+		:gap="40"
+		:items-to-show="1"
+		:wrap-around="true"
+		:autoplay="4200"
+		:transition="600"
+		:mouse-drag="false"
+		:touch-drag="true"
+	>
+		<Slide v-for="slide in slides" :key="slide.id">
+			<img :src="slide.formats?.medium?.url || slide.url" alt="Product Image" class="rounded-xl shadow-xl" />
+		</Slide>
+
+		<template #addons>
+			<Pagination />
+		</template>
+	</Carousel>
+</template>
+
+<script setup lang="ts">
+import "vue3-carousel/dist/carousel.css";
+import { Carousel, Slide, Pagination } from "vue3-carousel";
+import type { MediaData } from "~/types";
+
+defineProps<{
+	slides: MediaData[];
+}>();
+</script>