BREAKING CHANGE: Removed 'large-db' as standalone profile
New Design:
- Resource Profiles now purely represent VM capacity:
conservative, balanced, performance, max-performance
- LargeDBMode is a separate boolean toggle that modifies any profile:
- Reduces ClusterParallelism and Jobs by 50%
- Forces MaxLocksPerTxn = 8192
- Increases MaintenanceWorkMem
TUI Changes:
- 'l' key now toggles LargeDBMode ON/OFF instead of applying large-db profile
- New 'Large DB Mode' setting in settings menu
- Settings are persisted to .dbbackup.conf
This allows any resource profile to be combined with large database
optimization, giving users more flexibility on both small and large VMs.