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/constants.ts

@@ -0,0 +1,38 @@
+/**
+ * Zentrale Konstanten für die Anwendung.
+ * URLs, CMS-Resolve-Arrays und Fallback-Werte.
+ */
+
+/** Platzhalter-Bild für og:image / twitter:image, wenn weder Page/Post-Bild noch Logo gesetzt ist. */
+export const DEFAULT_SOCIAL_IMAGE_URL =
+  "https://images.ctfassets.net/xjxq6v7l1pfe/43yZHpF9OCnrBlEWHJSZMK/1ef20b265ea1e4e55317812ee5ae6b4c/simple-green-tree-illustrated-watercolor-with-gentle-shading-great-rural-scenery-farm-backdrops-naturethemed-designs-landsca.jpg";
+
+/** Parameter für og:image / twitter:image (über /cms-images + Disk-Cache). */
+export const SOCIAL_IMAGE_TRANSFORM = {
+  width: 200,
+  height: 200,
+  fit: "cover" as const,
+  format: "webp" as const,
+};
+
+/** CMS Content-Rows für resolve (Footer, Pages, Posts). */
+export const ROW_RESOLVE: string[] = [
+  "row1Content",
+  "row2Content",
+  "row3Content",
+];
+
+/** Resolve für Page-Requests: "all" = alle Referenzen inkl. verschachtelt (z. B. image_gallery.images). */
+export const PAGE_RESOLVE = ["all"];
+
+/** Resolve für Post-Requests: "all" damit auch img in row1Content/Image-Blöcken aufgelöst wird (src), sonst nur Referenz. */
+export const POST_RESOLVE = ["all"];
+
+/** Fallback-Slug für die Startseite, wenn page_config keine homePage liefert. */
+export const DEFAULT_HOME_PAGE_SLUG = "page-home";
+
+/** Site-Name für og:site_name und JSON-LD (in Layout via PUBLIC_SITE_NAME überschreibbar). */
+export const SITE_NAME = "Windwiderstand";
+
+/** Slug des Translation-Bundles im CMS (content/de/translation_bundle/{slug}.json5). Alle UI-Texte aus diesem Bundle. */
+export const TRANSLATION_BUNDLE_SLUG = "app";