- Replace `endpoint.get()` with `endpoint.filter()` in `get_or_create` to handle object retrieval more robustly and avoid potential exceptions with multiple results.
- Decouple `search_params` from `create_params` to correctly handle differences between API filtering keys (e.g., `group_id`, `vrf_id`) and creation keys (e.g., `group`, `vrf`).
- Refine IP address lookups to include `assigned_object_id` in search parameters, preventing ambiguous matches against IPs not assigned to the target interface.
