fix(lint): mark read_tty_line as an explicit re-export in _common.py

Pyright reportUnusedImport fired because the bare import is not used
within _common.py itself. The X as X idiom signals an intentional
public re-export without requiring __all__.

bot_bottle/cli/_common.py

@@ -5,7 +5,7 @@ from __future__ import annotations
 import os
 from pathlib import Path
 
-from ..util import read_tty_line
+from ..util import read_tty_line as read_tty_line
 
 PROG = "cli.py"
 USER_CWD = os.getcwd()