fix: correct pipelock constant imports in test file

Fixed ImportError in test_pipelock_apply.py:
- PIPELOCK_CA_CERT_IN_CONTAINER and PIPELOCK_CA_KEY_IN_CONTAINER
  are defined in bot_bottle.pipelock, not bot_bottle.backend.docker.pipelock
- Corrected import statement to import from correct module
- Removed unnecessary type: ignore comments

This fixes the integration test import failure.

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

tests/integration/test_pipelock_apply.py

@@ -32,11 +32,11 @@ from bot_bottle.backend.docker.network import (
     network_create_internal,
     network_remove,
 )
-from bot_bottle.backend.docker.pipelock import (
+from bot_bottle.pipelock import (
-    PIPELOCK_CA_CERT_IN_CONTAINER,  # type: ignore
+    PIPELOCK_CA_CERT_IN_CONTAINER,
-    PIPELOCK_CA_KEY_IN_CONTAINER,  # type: ignore
+    PIPELOCK_CA_KEY_IN_CONTAINER,
-    pipelock_tls_init,
 )
+from bot_bottle.backend.docker.pipelock import pipelock_tls_init
 from bot_bottle.pipelock import PipelockProxy
 from bot_bottle.backend.docker.pipelock_apply import (
     PipelockApplyError,