iven
7d1b1f9c7c
feat(ai): 向量搜索 + hit test API
- KnowledgeV2Service.vector_search: pgvector 余弦相似度搜索
- SearchHit DTO: chunk_id/document_id/similarity/metadata
- hit_test handler: POST /ai/documents/hit-test (embed query → 搜索)
- AiState 添加 embedding 字段,共享 EmbeddingService 实例
- top_k 限制最大 20
Phase 2 Task 11
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