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/ui/Toggle.svelte

@@ -0,0 +1,29 @@
+<script lang="ts">
+  let {
+    checked = $bindable(false),
+    disabled = false,
+    label = '',
+  } = $props();
+</script>
+
+<label class="inline-flex cursor-pointer items-center gap-2 {disabled ? 'cursor-not-allowed opacity-60' : ''}">
+  <span
+    class="relative inline-block h-6 w-11 shrink-0 rounded-full transition-all duration-200 {checked ? 'bg-wald-500' : 'bg-stein-300'}"
+    role="switch"
+    aria-checked={checked}
+  >
+    <input
+      type="checkbox"
+      class="sr-only"
+      bind:checked
+      {disabled}
+      onkeydown={(e) => e.key === ' ' && (checked = !checked)}
+    />
+    <span
+      class="absolute top-0.5 inline-block h-5 w-5 rounded-full bg-white shadow-sm transition-transform duration-200 {checked ? 'left-[22px] translate-x-0.5' : 'left-0.5'}"
+    />
+  </span>
+  {#if label}
+    <span class="text-base text-stein-700">{label}</span>
+  {/if}
+</label>