Initial commit: personal homepage with live Harbor registry

- Linktree-style homepage with photo, social links, and self-hosted
  services (container registry, Git server)
- Registry pages rendered on demand from Harbor via a live content
  collection, cached in memory (60s fresh, 10min stale-while-revalidate)
- Pinned registry images (PINNED_IMAGES) shown first with a star
- Node standalone server with security headers; self-contained server
  build so the Docker image ships no node_modules
- Gitea workflow building multi-arch images for Flux

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.env.example

@@ -0,0 +1,15 @@
+# Public URL of this site (canonical URLs, sitemap later on). Build time.
+SITE_URL=https://example.com
+
+# Harbor instance to showcase. Read at runtime by the server; changes need a restart, not a rebuild.
+HARBOR_URL=https://registry.example.com
+# Host shown in `docker pull` commands (defaults to the host of HARBOR_URL)
+# HARBOR_REGISTRY_HOST=registry.example.com
+# Comma-separated project allow-list (defaults to all public projects)
+# HARBOR_PROJECTS=library,tools
+# Optional read-only robot account; not needed for public projects
+# HARBOR_USERNAME=robot$showcase
+# HARBOR_PASSWORD=
+
+# Host port for docker compose (default 8080)
+# PORT=8080