feat(commands): add toggle autocomplete aliases

design/user-stories/us-004-unlock-and-control-base-flight.md

@@ -25,6 +25,8 @@ As a **player with Base I**, I want to unlock controlled flight around my base s
 - [x] Passing beyond the warning buffer removes only flight granted by this plugin.
 - [x] Flight is not granted outside the unlocked vertical range.
 - [x] `/baseflight` toggles the player's unlocked base flight on and off.
+- [x] `/baseflight on` enables flight idempotently and `/baseflight off` disables it idempotently, with `on` and `off` offered through autocomplete.
+- [x] `/homeflight` aliases `/baseflight` with identical behavior and autocomplete.
 - [x] The flight toggle persists across reconnects and restarts.
 - [x] The plugin handles teleportation, world changes, game-mode changes, death, logout, and plugin shutdown without leaving unintended flight enabled.