fix(types): resolve pyright errors introduced in #269 changes

- manifest.py: remove unused load_bottle_chain_from_dir import
- manifest_extends.py: drop redundant ManifestEgressRoute annotation
- test_cli_start_selector.py: remove unused call import
- test_cli_tui.py: move Optional/constants to top, annotate FakeScreen,
  remove unused curses import
- test_manifest_bottle_merge.py: add type args to dict, annotate **kwargs

tests/unit/test_cli_start_selector.py

@@ -11,7 +11,7 @@ from __future__ import annotations
 
 import os
 import unittest
-from unittest.mock import MagicMock, call, patch
+from unittest.mock import MagicMock, patch
 
 import bot_bottle.cli.start as start_mod
 import bot_bottle.cli.tui as tui_mod