Config file loading fixes:
- Fix tilde expansion in config paths (~/.config/systant/systant.toml)
- Add detailed debug logging for config file search paths
- Properly expand home directory paths with System.user_home()
MQTT connection improvements:
- Add clearer connection status logging with broker host:port
- Improve error handling in connection callback
- Better error messages when connection fails or is lost
- More detailed initial connection logging
These fixes address production deployment issues where config files
aren't found and MQTT connection errors aren't properly reported.
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Co-Authored-By: Claude <noreply@anthropic.com>
ryanandClaude
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