wiki: add n8n reverse proxy X-Forwarded-For trust fix article

Documents the N8N_PROXY_HOPS env var needed for n8n behind Caddy/Nginx
when N8N_TRUST_PROXY alone is insufficient in newer versions.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

SUMMARY.md

@@ -49,6 +49,7 @@
     * [Fail2ban & UFW Rule Bloat Cleanup](05-troubleshooting/networking/fail2ban-ufw-rule-bloat-cleanup.md)
     * [Custom Fail2ban Jail: Apache Directory Scanning](05-troubleshooting/security/apache-dirscan-fail2ban-jail.md)
     * [Nextcloud AIO Unhealthy 20h After Nightly Update](05-troubleshooting/docker/nextcloud-aio-unhealthy-20h-stuck.md)
+    * [n8n Behind Reverse Proxy: X-Forwarded-For Trust Fix](05-troubleshooting/docker/n8n-proxy-trust-x-forwarded-for.md)
     * [Docker & Caddy Recovery After Reboot (Fedora + SELinux)](05-troubleshooting/docker-caddy-selinux-post-reboot-recovery.md)
     * [ISP SNI Filtering with Caddy](05-troubleshooting/isp-sni-filtering-caddy.md)
     * [Obsidian Vault Recovery — Loading Cache Hang](05-troubleshooting/obsidian-cache-hang-recovery.md)