优化代码，提高解耦

03_function_calling_tools/02_api_invocation.py

@@ -1,14 +1,10 @@
-from dotenv import load_dotenv
+from config import OPENAI_API_KEY
 from openai import OpenAI
-import json
-import os
 import requests
 
-load_dotenv()
 
 def create_client():
-    api_key = os.getenv("OPENAI_API_KEY")
-    return OpenAI(api_key=api_key, base_url="https://api.deepseek.com")
+    return OpenAI(api_key=OPENAI_API_KEY, base_url="https://api.deepseek.com")
 
 # 通过api调用获得当前ip与位置
 def get_addr():