Add settings export/import feature for easy backup/restore
- Added export_settings: backs up all config to timestamped .tar.gz - Core config (sites, touch controls, passwords) - Schedule timers (power, display, quiet hours) - Addon configs (Squeezelite, VNC, Easy Asterisk) - Added import_settings: restores from backup file - Lists available backups in home directory - Enables timers and sets permissions automatically - Added to Advanced menu (options 8 and 9) - Bump version to 0.9.9
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