Fix: use 'bind': '0.0.0.0' in config instead of invalid CLI flag

Dockerfile

@@ -31,6 +31,7 @@ if [ ! -f /root/.openclaw/openclaw.json ]; then\n\
 {\n\
   "gateway": {\n\
     "mode": "local",\n\
+    "bind": "0.0.0.0",\n\
     "port": 7860,\n\
     "auth": {\n\
       "mode": "token",\n\
@@ -60,8 +61,7 @@ openclaw doctor --fix\n\
 \n\
 # Start OpenClaw gateway\n\
 echo "Starting OpenClaw gateway on port 7860..."\n\
-# Try to bind to 0.0.0.0\n\
-exec openclaw gateway run --port 7860 --host 0.0.0.0\n\
+exec openclaw gateway run --port 7860\n\
 ' > /usr/local/bin/start-openclaw && chmod +x /usr/local/bin/start-openclaw
 
 CMD ["/usr/local/bin/start-openclaw"]