Add Nginx frontend + Backend Docker setup for Coolify deployment

nginx.conf

@@ -0,0 +1,28 @@
+server {
+    listen 80;
+    server_name _;
+
+    # Frontend static files
+    root /var/www/html;
+    index index.html;
+
+    # API reverse proxy zum Backend
+    location /api/ {
+        proxy_pass http://backend:8000/api/;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+
+    location /health {
+        proxy_pass http://backend:8000/health;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+    }
+
+    # Alles andere → index.html (SPA fallback)
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+}