Initial SvelteKit frontend port of windwiderstand.de

Full parity with Astro site: content rows, post/tag routes, pagination,
event badges + OSM map, comments, Live-Search via /api/search-index,
CMS image proxy, RSS, sitemap.

Deploy: Dockerfile + docker-compose.prod.yml + Gitea Actions workflow
to build + push to git.pm86.de registry and ssh-deploy to Contabo.

src/lib/components/Card.svelte

@@ -0,0 +1,32 @@
+<script lang="ts">
+  import type { Snippet } from "svelte";
+
+  let {
+    children,
+    href,
+    target,
+    rel,
+    class: className = "",
+  }: {
+    children?: Snippet;
+    href?: string;
+    target?: string;
+    rel?: string;
+    class?: string;
+  } = $props();
+
+  const base = "relative flex flex-col gap-2 rounded-lg border border-stein-200 bg-white p-4 shadow-sm min-w-0 overflow-hidden";
+  const interactive = $derived(
+    href ? "hover:border-stein-300 hover:shadow-md transition-all no-underline text-inherit" : "",
+  );
+</script>
+
+{#if href}
+  <a {href} {target} {rel} class="{base} {interactive} {className}">
+    {@render children?.()}
+  </a>
+{:else}
+  <div class="{base} {className}">
+    {@render children?.()}
+  </div>
+{/if}