fix(vector_store): remove leftover sync placeholders shadowing async search in 6 backends

[Anai-Guo]

Problem

Six stub vector-store backends each carry a trailing block of synchronous add / search / delete placeholder methods appended after their proper async implementations:

• bageldb.py, clarifai.py, dashvector.py, databricks_vector_search.py, dingo.py, epsilla.py

Because the sync def search(...) comes last, it shadows the already-present async def search(...) earlier in the same class. The live search therefore:

1. No longer matches the async VectorStoreBackend.search interface (base.py), so await backend.search(...) no longer awaits a coroutine.
2. Drops the accurate "…is not implemented: use an implemented backend such as FAISS, Chroma, Qdrant, …" message in favor of the cruder "…is a placeholder. Integrate with … SDK.".

pyflakes flags the shadow directly, e.g.:

multimind/vector_store/bageldb.py:135:5: redefinition of unused 'search' from line 53

The accompanying add / delete placeholders are not part of the backend interface either — it defines add_vectors / delete_vectors (both already implemented as async in these files) — and are not referenced anywhere in the codebase.

Fix

Remove the redundant trailing placeholder blocks so the proper async stub methods are the live ones again. No behavior is lost (both variants only raise NotImplementedError); the interface-conformant async search and its accurate guidance message are restored.

+0 / −104, six files. pyflakes no longer reports any redefinition in these modules and all six still compile.

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