feat(RAG): 更新RAG模块代码和文档

refactor: 简化Embeddings和LLM类实现，移除不必要依赖
docs: 更新文档内容，添加硅基流动API使用说明
chore: 更新requirements.txt依赖版本

docs/chapter7/RAG/VectorBase.py

@@ -2,16 +2,16 @@
 # -*- coding: utf-8 -*-
 '''
 @File    :   VectorBase.py
-@Time    :   2024/02/12 10:11:13
+@Time    :   2025/06/20 10:11:13
 @Author  :   不要葱姜蒜
-@Version :   1.0
+@Version :   1.1
 @Desc    :   None
 '''
 
 import os
 from typing import Dict, List, Optional, Tuple, Union
 import json
-from RAG.Embeddings import BaseEmbeddings, OpenAIEmbedding, JinaEmbedding, ZhipuEmbedding
+from Embeddings import BaseEmbeddings, OpenAIEmbedding
 import numpy as np
 from tqdm import tqdm