Enable Basic Auth for Netdata monitoring

- Activated auth_basic in nginx config for eckardt-monitoring.duckdns.org
- htpasswd file at C:/nginx/conf/.htpasswd

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

configs/nginx/nginx.conf

@@ -202,9 +202,9 @@ http {
         ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256;
         ssl_prefer_server_ciphers off;
 
-        # HTTP Basic Auth (empfohlen da Netdata keine Auth hat)
-        # auth_basic "Netdata Monitoring";
-        # auth_basic_user_file C:/nginx/conf/.htpasswd;
+        # HTTP Basic Auth
+        auth_basic "Netdata Monitoring";
+        auth_basic_user_file C:/nginx/conf/.htpasswd;
 
         location / {
             limit_req zone=general burst=50 nodelay;