clip2md: Paste-to-Markdown Tool (Turndown+GFM, Nginx, Coolify-ready)

- Smart Paste: HTML->Markdown, sonst roh; Cmd/Ctrl+Shift+V erzwingt roh
- Auto-Dateiname aus Titel + Datum, editierbar
- Speichern via Button / Cmd+Ctrl+S, Kopieren, Leeren, Zaehler
- Vendored Turndown 7.2.4 + turndown-plugin-gfm 1.0.2 (kein CDN)
- nginx:alpine Dockerfile + Healthcheck

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Dockerfile

@@ -0,0 +1,11 @@
+FROM nginx:1.27-alpine
+
+# Static single-page app — no build step.
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+COPY index.html /usr/share/nginx/html/index.html
+COPY vendor/ /usr/share/nginx/html/vendor/
+
+EXPOSE 80
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=5s --retries=3 \
+  CMD wget -q -O /dev/null http://127.0.0.1/healthz || exit 1