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zhuyongxin f035538531 feat(rag): dense+BM25 hybrid on MilvusClientV2, drop SDK path
Replace legacy MilvusServiceClient knowledge search/write with a single
MilvusClientV2 hybrid store (BM25 function + dense ANN + RRFRanker).
Use collection biz_hybrid and require knowledge reindex.
2026-07-27 18:49:20 +08:00

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# Decisions
- Single backend: MilvusClientV2 only for knowledge RAG
- Drop sdk/spring/auto retrieval routing
- New collection biz_hybrid to avoid mutating legacy biz schema in place
- Hybrid = dense ANN + BM25 sparse ANN + RRFRanker
- Dense L2 enrichment for threshold compatibility on hybrid hits