Add runtime-generated config paths to .gitignore

config/api/dns/, config/api/network.json, config/api/webdav/ are
created at API startup and should never be tracked.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -21,8 +21,10 @@ config/api/caddy/Caddyfile
 config/api/calendar.json
 config/api/cell_config.json
 config/api/wireguard.json
-config/api/webdav/webdav.conf
+config/api/webdav/
 config/api/dhcp/
+config/api/dns/
+config/api/network.json
 config/caddy/Caddyfile
 config/dhcp/dnsmasq.conf
 config/dns/Corefile