feat(memory): 新增 VectorStore 抽象与 RagPipeline 持久化管线

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- 新增 src/memory/vector_store.rs（约 660 行）：

  - VectorStore trait：批量 add / search / remove + add_one 默认实现

  - InMemoryVectorStore：Mutex<HashMap> + 余弦全量扫描（锁内克隆、锁外计算）

  - PersistentVectorStore：MemoryStore 包装，JSON blob 持久化，先持久化后内存

  - RagPipeline：split → embed → store 组合器（具体 struct，非 trait）

- 22 个内联测试覆盖 InMemory（10）/ Persistent（6）/ RagPipeline（4）/ 性能基准（2）

- 性能断言：search 10K 条 <100ms，PersistentVectorStore::new 加载 <500ms

- 标记 VectorRetriever / InMemoryVectorRetriever 为 #[deprecated(since="0.3.0")]

- memory.rs 追加 VectorStore 等 4 个类型的 re-export

- document_demo 从手动 VectorRetriever 循环迁移到 RagPipeline 两行调用

- 零新增外部依赖

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徐涛

2026-07-09 16:51:29 +08:00

parent b04427e83f

commit 32d886f870

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docs/21-phase15-vector-store-persistence.md

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