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/routes/posts/+page.svelte

@@ -0,0 +1,39 @@
+<script lang="ts">
+  import BlogOverview from '$lib/components/BlogOverview.svelte';
+  import { t, T } from '$lib/translations';
+  import type { PageData } from './$types';
+
+  let { data }: { data: PageData } = $props();
+</script>
+
+<svelte:head>
+  <title>{data.seoTitle}</title>
+  {#if data.seoDescription}
+    <meta name="description" content={data.seoDescription} />
+  {/if}
+</svelte:head>
+
+<div class="mb-6 pt-10 pageTitle">
+  <h1>{t(data.translations, T.posts_title)}</h1>
+  <h2>{t(data.translations, T.posts_subtitle)}</h2>
+</div>
+<div class="content mt-8">
+  {#if data.cmsError}
+    <div class="rounded-sm border border-amber-200 bg-amber-50 p-4 text-amber-800">
+      <strong>{t(data.translations, T.posts_cms_error)}</strong> {data.cmsError}
+    </div>
+  {:else}
+    <BlogOverview
+      posts={data.posts}
+      tags={data.tags}
+      activeTag={data.activeTag}
+      currentPage={data.currentPage}
+      totalPages={data.totalPages}
+      totalPosts={data.totalPosts}
+      basePath="/posts"
+      translations={data.translations}
+      upcomingEvents={data.upcomingEvents}
+      searchIndex={data.searchIndex}
+    />
+  {/if}
+</div>