Add push monitors for system metrics and fix anthropic version

- Add disk, memory, CPU, and updates push monitor suggestions
- Update Claude prompt to always suggest system health monitors
- Fix anthropic library version compatibility (proxies error)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/requirements.txt

@@ -2,7 +2,7 @@ flask==3.0.0
 flask-cors==4.0.0
 flask-socketio==5.3.6
 paramiko==3.4.0
-anthropic==0.39.0
+anthropic>=0.40.0
 requests==2.31.0
 python-dotenv==1.0.0
 gevent==23.9.1