refactor(src/services): simplify TodoService and remove unused ConfigService stop function

Remove redundant import duplication, replace uuid with os.urandom, rename completion_rate to active, update property decorator, and clean up callback handling. Also removed unused stop_config_service function.

src/services/__init__.py

@@ -6,6 +6,6 @@ from .keyboard_layout import KeyboardLayout  # noqa: F401
 from .network import NetworkClient, Wifi, Ethernet  # noqa: F401
 from .mpris import PlayerService, PlayerManager  # noqa: F401
 from .mpris import PlayerService as MprisPlayer, PlayerManager as MprisPlayerManager  # noqa: F401
-from .todo import TodoService  # noqa: F401
 from .modus import ModusService  # noqa: F401
+from .todo import TodoService  # noqa: F401
 from .config import on_config_change, start_config_service, ConfigService  # noqa: F401