fix: correct host_db_path import and stale-check test expectations

- config_store.py imported host_db_path from supervise_types (wrong);
  it lives in paths.py, matching all other stores (audit, queue, etc.)
- test_stale_checks: two tests expected check_stale called twice
  (agent + sidecar) — consolidated arch has no sidecar, so once is
  correct; update assertions and remove unused Path import

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

bot_bottle/config_store.py

@@ -7,11 +7,11 @@ from pathlib import Path
 try:
     from .db_store import DbStore
     from .migrations import TableMigrations
-    from .supervise_types import host_db_path
+    from .paths import host_db_path
 except ImportError:
     from db_store import DbStore  # type: ignore[import-not-found]  # pylint: disable=import-error,no-name-in-module
     from migrations import TableMigrations  # type: ignore[import-not-found]  # pylint: disable=import-error,no-name-in-module
-    from supervise_types import host_db_path  # type: ignore[import-not-found]  # pylint: disable=import-error,no-name-in-module
+    from paths import host_db_path  # type: ignore[import-not-found]  # pylint: disable=import-error,no-name-in-module
 
 
 DEFAULT_CACHED_IMAGE_STALE_WARNING_DAYS = 1