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>

.gitignore

@@ -0,0 +1,3 @@
+node_modules/
+*.tgz
+.DS_Store