refactor: move bottle_state.py to top-level bot_bottle package

Both docker and smolmachines backends use bottle state helpers.
Moving to bot_bottle/ makes the sharing explicit and removes the
cross-backend dependency (smolmachines importing from ..docker).

All callers updated: docker backend, smolmachines backend, cli
modules, and tests.

bot_bottle/backend/docker/launch.py

@@ -43,7 +43,7 @@ from . import network as network_mod
 from . import util as docker_mod
 from .bottle import DockerBottle
 from .bottle_plan import DockerBottlePlan
-from .bottle_state import (
+from ...bottle_state import (
     bottle_state_dir,
     egress_state_dir,
     git_gate_state_dir,