Update Meilisearch delete_documents to use filter instead of deprecated ids parameter

The meilisearch Python SDK has deprecated the positional ids parameter in Index.delete_documents(). Our code in poliloom/search.py:160 passes document IDs positionally, triggering a DeprecationWarning on every call:

DeprecationWarning: The use of ids is depreciated and will be removed in the future

What needs to change

1. Add "id" to filterableAttributes in the index settings (search.py:69) so filter-based deletion works
2. Switch delete_documents call from positional ids to the filter keyword argument:

# Current (deprecated)
index.delete_documents(batch)

# Replacement
id_list = ", ".join(f'"{doc_id}"' for doc_id in batch)
index.delete_documents(filter=f"id IN [{id_list}]")

3. Rebuild index settings (or run index-create) after deploying the filterableAttributes change

References

• PR #756: Add ability to delete documents by filter — introduced the filter parameter and deprecated ids
• Meilisearch v1.2.0 release — server-side support for POST /indexes/{uid}/documents/delete with filter

Start in poliloom/search.py at lines 69 and 160: inspect the index settings and the delete_documents call. Update filterableAttributes and use the filter-based deletion described in the issue, then rebuild the index settings or run index-create. Done means deletions no longer use the deprecated ids parameter and the warning is gone.