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/FeatureModule.vue

@@ -0,0 +1,62 @@
+<template>
+	<section class="feature-module py-16 lg:py-24">
+		<div class="xl:container mx-auto px-6">
+			<div class="grid lg:grid-cols-2 gap-8 lg:gap-16 items-center">
+				<!-- Image -->
+				<div :class="imageRight ? 'lg:order-2' : ''">
+					<img
+						v-if="image"
+						:src="image"
+						:alt="headline"
+						class="rounded-xl shadow-md w-full object-cover aspect-[4/3]"
+						loading="lazy"
+					/>
+					<div v-else class="rounded-xl bg-gray-200 w-full aspect-[4/3] flex items-center justify-center">
+						<span class="text-gray-400 text-sm">Bild folgt</span>
+					</div>
+				</div>
+
+				<!-- Content -->
+				<div class="lg:w-4/5">
+					<p v-if="eyebrow" class="text-sm uppercase tracking-widest opacity-60 mb-2">
+						{{ eyebrow }}
+					</p>
+					<h2 class="font-display text-3xl lg:text-4xl font-bold mb-4">
+						{{ headline }}
+					</h2>
+					<p v-if="subtitle" class="text-xl lg:text-2xl opacity-80 mb-6">
+						{{ subtitle }}
+					</p>
+					<div class="prose prose-lg max-w-none text-gray-700 leading-relaxed" v-html="formattedBody"></div>
+				</div>
+			</div>
+		</div>
+	</section>
+</template>
+
+<script setup lang="ts">
+const props = defineProps<{
+	eyebrow?: string;
+	headline: string;
+	subtitle?: string;
+	body: string;
+	image?: string;
+	imageRight?: boolean;
+}>();
+
+// Clean up multi-line template strings (remove extra whitespace from indentation)
+const formattedBody = computed(() => {
+	return props.body
+		.split("\n")
+		.map((line) => line.trim())
+		.join(" ")
+		.replace(/\s+/g, " ")
+		.trim();
+});
+</script>
+
+<style scoped>
+.feature-module :deep(strong) {
+	@apply font-semibold text-gray-900;
+}
+</style>