refactor: Update libs/llm.py to use ChatGoogleGenerativeAI instead of GoogleGenerativeAI

libs/llm.py

@@ -1,7 +1,7 @@
 # llm.py
 from langchain_openai import ChatOpenAI
 from langchain_anthropic import ChatAnthropic
-from langchain_google_genai import GoogleGenerativeAI
+from langchain_google_genai import ChatGoogleGenerativeAI
 from langchain_groq import ChatGroq
 from langchain_community.chat_models import ChatOllama
 from langchain_core.runnables import ConfigurableField
@@ -35,7 +35,7 @@ def get_llm(streaming=True):
             streaming=streaming,
             callbacks=[StreamCallback()],
         ),
-        gemini_1_5_flash=GoogleGenerativeAI(
+        gemini_1_5_flash=ChatGoogleGenerativeAI(
             model="gemini-1.5-flash",
             temperature=0,
             streaming=streaming,