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/RustyImage.svelte

@@ -0,0 +1,25 @@
+<script lang="ts">
+  /**
+   * Dünner img-Wrapper: `src` ist typischerweise von getCmsImageUrl / ensureTransformedImage (/cms-images?…).
+   */
+  interface Props {
+    /** Aufgelöster Bildpfad (z. B. ensureTransformedImage). */
+    src: string;
+    width?: number;
+    height?: number;
+    alt?: string;
+    class?: string;
+    loading?: "lazy" | "eager";
+  }
+
+  let { src, width, height, alt = "", class: className = "", loading = "lazy" }: Props = $props();
+</script>
+
+<img
+  {src}
+  {alt}
+  {width}
+  {height}
+  class={className}
+  {loading}
+/>