Refactor fail2ban DB path lookup and simplify geo router response

backend/app/utils/fail2ban_db_utils.py

@@ -5,26 +5,12 @@ from __future__ import annotations
 import json
 from datetime import UTC, datetime
 
-from app.services.fail2ban_metadata_service import default_fail2ban_metadata_service
-
 
 def ts_to_iso(unix_ts: int) -> str:
     """Convert a Unix timestamp to an ISO 8601 UTC string."""
     return datetime.fromtimestamp(unix_ts, tz=UTC).isoformat()
 
 
-async def get_fail2ban_db_path(socket_path: str, *, force_refresh: bool = False) -> str:
-    """Return the fail2ban database path, using cached metadata when available."""
-    return await default_fail2ban_metadata_service.get_db_path(
-        socket_path, force_refresh=force_refresh
-    )
-
-
-def invalidate_fail2ban_db_path(socket_path: str) -> None:
-    """Invalidate the cached fail2ban database path for the given socket."""
-    default_fail2ban_metadata_service.invalidate_db_path(socket_path)
-
-
 def parse_data_json(raw: object) -> tuple[list[str], int]:
     """Extract matches and failure count from the fail2ban bans.data value."""
     if raw is None: