fix: dockerfile syntax error and CMD separation

Dockerfile

@@ -25,7 +25,7 @@ ENV FEISHU_DM_POLICY=open
 EXPOSE 7860
 
 # Create a startup script that generates config and starts OpenClaw
-RUN echo '#!/bin/bash\n\
+RUN printf '#!/bin/bash\n\
 set -x\n\
 \n\
 # Use /tmp/.openclaw as the config home\n\
@@ -41,8 +41,6 @@ if [ -z "$ANTHROPIC_AUTH_TOKEN" ]; then\n\
 fi\n\
 \n\
 # Always ensure we have a clean config with required values\n\
-# We use the openai provider as it is more flexible with custom model names\n\
-# and api.z.ai is typically compatible with both.\n\
 cat > "$OPENCLAW_HOME/openclaw.json" << EOF\n\
 {\n\
   "env": {\n\
@@ -107,7 +105,6 @@ openclaw doctor --fix\n\
 \n\
 # Start OpenClaw gateway\n\
 echo "Starting OpenClaw gateway on port 7860..."\n\
-exec openclaw gateway run --port 7860 --allow-unconfigured\n\
-' > /usr/local/bin/start-openclaw && chmod +x /usr/local/bin/start-openclaw\n\
-\n\
-CMD ["/usr/local/bin/start-openclaw"]\n\
+exec openclaw gateway run --port 7860 --allow-unconfigured\n' > /usr/local/bin/start-openclaw && chmod +x /usr/local/bin/start-openclaw
+
+CMD ["/usr/local/bin/start-openclaw"]