reduce duplicate qdrant api calls in hybrid auto-detect #42

reduce duplicate qdrant api calls in hybrid auto-detect

problem

when inserting into hybrid collection or dense collection with topology:

1. _resolve_topology() calls collection_exists() then get_collection() if exists
2. _ensure_collection() calls get_collection() again to validate dimensions

this means two http round-trips to qdrant for the same collection info every insert.

solution

introduce a unified collection info method that fetches all needed topology and config data in one qdrant api call
both the topology resolution and collection validation use this same result so they don't need separate calls

i can work on this