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/OpeningHours.vue

@@ -0,0 +1,16 @@
+<template>
+	<div class="space-y-2">
+		<div v-for="day in hours" :key="day.day" class="flex justify-between py-2 border-b border-gray-100 last:border-0">
+			<span class="font-medium">{{ day.day }}</span>
+			<span :class="day.hours === 'Geschlossen' ? 'text-gray-400' : 'text-gray-900'">{{ day.hours }}</span>
+		</div>
+	</div>
+</template>
+
+<script setup lang="ts">
+import type { OpeningHoursDay } from "~/composables/usePageContent";
+
+defineProps<{
+	hours: OpeningHoursDay[];
+}>();
+</script>