refactor: add ai agents and implement extract people agent

src/agents/base_agent.py

@@ -0,0 +1,22 @@
+
+from langchain_openai import ChatOpenAI
+from utils.config import get_instance as get_config
+
+class BaseAgent:
+    def __init__(self, api_url: str = None, api_key: str = None, model_name: str = None):
+        config = get_config()
+        llm_api_url = api_url or config.get("ai", "llm_api_url")
+        llm_api_key = api_key or config.get("ai", "llm_api_key")
+        llm_model_name = model_name or config.get("ai", "llm_model_name")
+        self.llm = ChatOpenAI(
+            openai_api_key=llm_api_key,
+            openai_api_base=llm_api_url,
+            model_name=llm_model_name,
+        )
+    pass
+
+
+class SummaryPeopleAgent(BaseAgent):
+    def __init__(self):
+        super().__init__()
+    pass