Beta v0.11.0

• Command injection vulnerabilities completely fixed with defense-in-depth approach
• API authentication implemented with token-based security and backward compatibility
• Comprehensive error handling and logging implemented across all modules
• Threading patterns standardized with graceful shutdown support
• MQTT connection retry logic with exponential backoff and automatic reconnection
• Last Will and Testament (LWT) for Home Assistant availability tracking
• Connection state management with thread-safe coordination
• PEP 8 import statements applied to all files
• Updater status is now a firmware sensor