MainWP Child 6.0.3

Fixed: Autoload settings for legacy data to optimize database performance.
Fixed: UpdraftPlus remote storage settings management to properly clear backed-up remote settings when explicitly disabled
Updated: Database upgrade tracking with automatic version detection and improved compatibility handling.
Updated: Automatically migrate legacy BackWPup scheduled backup arguments during startup so existing scheduled backups continue running after upgrade.
Updated: Adjusted the timing of cache purge verification to better coordinate with WordPress plugin initialization.
Updated: Improved the UpdraftPlus backup schedule deletion functionality for enhanced reliability.