fix(llm_invoker): 添加环境变量加载确保能正确获取API密钥

src/utils/llm_invoker.py

@@ -12,6 +12,7 @@ import time
 from typing import Any, List, Dict, Optional
 
 from google import genai
+from dotenv import load_dotenv
 
 from src.utils.logger import get_logger
 from src.utils.json_extractor import JSONExtractor
@@ -30,6 +31,7 @@ def _get_client():
     """获取 Gemini Client 实例"""
     global _client
     if _client is None:
+        load_dotenv()
         api_key = os.getenv("GEMINI_API_KEY") or os.getenv("GOOGLE_API_KEY")
         if not api_key:
             raise ValueError("GEMINI_API_KEY or GOOGLE_API_KEY not found in environment")