Fix empty logs: replace nginx stdout/stderr symlinks with real files

nginx:alpine symlinks access.log/error.log to /dev/stdout and
/dev/stderr by default, so tail reads nothing.

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

nginx/entrypoint.sh

@@ -13,6 +13,10 @@ export WEBUI_PORT_HTTP="${WEBUI_PORT_HTTP:-8080}"
 # Replace env vars in nginx config template
 envsubst '${WEBUI_PORT} ${WEBUI_PORT_HTTP}' < /etc/nginx/nginx.conf.template > /etc/nginx/nginx.conf
 
+# Remove default symlinks to stdout/stderr and create real log files
+rm -f /var/log/nginx/access.log /var/log/nginx/error.log
+touch /var/log/nginx/access.log /var/log/nginx/error.log
+
 # Ensure conf.d directory exists with empty config
 mkdir -p /etc/nginx/conf.d
 touch /etc/nginx/conf.d/proxy-targets.conf