Introduce `backtunnel-umount` as a portable unmount helper, preferring `fusermount3`, `fusermount`, or `umount`. Add `BACKTUNNEL_HOSTKEY_POLICY` for configurable host key handling in `backtunnel-share` and `backtunnel-access`. Update TUIs for remote folder prompts and mount point handling. Enhance bash completion for TUI commands with directory suggestions. Revamp terminal selection logic in `backtunnel-open-term` to prioritize modern emulators like wezterm. Extend tests with scaffolds for host key policy and unmount behavior. Update README with new scripts, workflows, features, and troubleshooting tips.
Add `backtunnel-open-term`, `backtunnel-share-tui`, and `backtunnel-access-tui` scripts for terminal-based interaction. Update Dolphin service menus to enable TUI workflows, with improved terminal detection logic. Enhance installation and uninstallation scripts to handle new files. Update README with terminal workflow details and logging information.
