V4.6.6-2

[c121914yu]

1. 修改计量方式
2. 修改知识库搜索方式，引入RRF合并方式。
3. 抽象向量引擎，为引入其他向量数据库准备。

[sweep-ai[bot]]

Apply Sweep Rules to your PR?

• [ ] Apply: All new business logic should have corresponding unit tests.
• [ ] Apply: Refactor large functions to be more modular.
• [ ] Apply: Add docstrings to all functions and file headers.

[c121914yu]

🤖 Generated by deploy action

👀 Visit Preview