iven
10c28df152
docs(ai): AI 知识库 V2 设计规格 — 统一知识管理平台
替换旧三层模型（rules/references/guides）为 Dify 风格统一知识库：
- 3 张新表：knowledge_bases / documents / chunks（切片+向量）
- 文档处理管线：PDF/Word/Excel/URL/Markdown/手动录入 → 智能切片 → embedding
- 混合意图路由：关键词粗筛 → 向量检索 → LLM 兜底
- AI 客服集成：RAG context 注入 + [ref:xxx] 引用溯源
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