Proposal: optional Milvus vector store backend for RAG storage

[zc277584121]

Hi maintainers,

I noticed EvoAgentX already has a vector-store abstraction in the RAG storage area, including a VectorStoreBase shape and VectorStoreType selection. From a quick read, FAISS seems to be the only currently enabled backend, while Qdrant appears in config/documentation hints.

Would you be open to expanding this backend abstraction and adding Milvus as an optional vector store?

A possible scoped approach:

1. Keep FAISS as the default local backend.
2. Clarify the backend registry / factory path for third-party vector stores.
3. Add a Milvus backend behind an optional dependency and config value.
4. Support Milvus Lite for local development, plus Milvus server / Zilliz Cloud for larger deployments.
5. Add focused tests for backend selection and search behavior.

This would let users scale the same RAG workflow from local FAISS to a managed or server-backed vector database without changing the higher-level EvoAgentX APIs. Would this direction be welcome?

[TedSIWEILIU]

Thanks, your read is correct — FAISS is the default, and VectorStoreBase is meant to be pluggable. We'd welcome a Milvus backend. Feel free to go ahead and open a PR. Just two things to keep it smooth: keep FAISS the default and put Milvus behind an optional dependency (lazy import), and conform to the existing VectorStoreBase interface. Milvus Lite is fine for local dev/tests. Looking forward to it!