诊断并提升 Qdrant 搜索相关性。适用于用户反馈 “search results are bad”“wrong results”“low precision”“low recall”“irrelevant matches”“missing expected results”，或询问 “how to improve search quality?”“which embedding model?”“should I use hybrid search?”“should I use reranking?” 时。也适用于量化、模型变更或 da 后搜索质量下降时。
