docs: add remote access guide with Dynamic DNS + port forwarding

README.md

@@ -47,6 +47,24 @@ Once done, open the web interface in your browser (the script prints the URL).
 
 ---
 
+### Remote Access (Optional)
+
+To access NextNVR from outside your home network:
+
+1. **Dynamic DNS** — use a free provider like DuckDNS, No-IP, or Cloudflare to get a domain name (e.g. `myhouse.duckdns.org`)
+2. **Port forwarding** — in your router settings, forward these ports to the NextNVR server:
+
+| Port | Service | Required |
+|------|---------|----------|
+| `8080` | Web UI | Yes |
+| `1984` | Live streaming | **Yes — live view won't work without it** |
+
+Then access your cameras from anywhere: `http://myhouse.duckdns.org:8080`
+
+> ⚠️ For production use, put NextNVR behind a reverse proxy (like Zoraxy or Nginx) with HTTPS to secure your connection.
+
+---
+
 ## Server
 
 | What | Detail |