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>

nginx.conf

@@ -0,0 +1,38 @@
+server {
+    listen 80;
+    server_name _;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    # Gzip for the text assets.
+    gzip on;
+    gzip_types text/html text/css application/javascript application/json image/svg+xml;
+    gzip_min_length 512;
+
+    # Lightweight health endpoint for Coolify / Docker healthcheck.
+    location = /healthz {
+        access_log off;
+        add_header Content-Type text/plain;
+        return 200 "ok\n";
+    }
+
+    # Vendor libs can be cached hard.
+    location /vendor/ {
+        expires 30d;
+        add_header Cache-Control "public, immutable";
+    }
+
+    # Never cache the app shell, so updates land immediately.
+    location = /index.html {
+        add_header Cache-Control "no-cache";
+    }
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    # Minimal hardening headers.
+    add_header X-Content-Type-Options "nosniff" always;
+    add_header X-Frame-Options "SAMEORIGIN" always;
+    add_header Referrer-Policy "no-referrer" always;
+}