fix: update pipelock constant imports in compose.py

Move PIPELOCK_CA_CERT_IN_CONTAINER and PIPELOCK_CA_KEY_IN_CONTAINER
imports from the docker-specific pipelock module to the platform-neutral
bot_bottle.pipelock module, where they are actually defined. Keep
PIPELOCK_PORT from the docker module as it is docker-specific.

Fixes import error: cannot import name 'PIPELOCK_CA_CERT_IN_CONTAINER'
from 'bot_bottle.backend.docker.pipelock'

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

bot_bottle/backend/docker/compose.py

@@ -71,11 +71,11 @@ from .git_gate import (
     GIT_GATE_ENTRYPOINT_IN_CONTAINER,
     GIT_GATE_HOOK_IN_CONTAINER,
 )
-from .pipelock import (
+from ...pipelock import (
     PIPELOCK_CA_CERT_IN_CONTAINER,
     PIPELOCK_CA_KEY_IN_CONTAINER,
-    PIPELOCK_PORT,
 )
+from .pipelock import PIPELOCK_PORT
 from .sidecar_bundle import (
     SIDECAR_BUNDLE_DOCKERFILE,
     SIDECAR_BUNDLE_IMAGE,