Remove daemon mode references and unused config fields

The --daemon flag, BackupInterval, FullScanInterval, MinTimeBetweenRun
config fields, and DirtyPath model were placeholders for a never-shipped
daemon mode and have been removed. Daemon mode is out of scope for 1.0.

TODO.md

@@ -103,26 +103,3 @@ User must have rclone configured separately (via `rclone config`).
    - Ensure consistent code style
 
 1. Tag and release v1.0.0
-
----
-
-## Post-1.0 (Daemon Mode)
-
-1. Implement inotify file watcher for Linux
-   - Watch source directories for changes
-   - Track dirty paths in memory
-
-1. Implement FSEvents watcher for macOS
-   - Watch source directories for changes
-   - Track dirty paths in memory
-
-1. Implement backup scheduler in daemon mode
-   - Respect backup_interval config
-   - Trigger backup when dirty paths exist and interval elapsed
-   - Implement full_scan_interval for periodic full scans
-
-1. Add proper signal handling for daemon
-   - Graceful shutdown on SIGTERM/SIGINT
-   - Complete in-progress backup before exit
-
-1. Write tests for daemon mode