Fix: Resolve all import errors and dependency issues

- Fix langchain imports: memory and tools now from langchain_community
- Add missing 'requests' package to requirements
- Correct google-generativeai package name in pyproject.toml
- Sync requirements.txt and pyproject.toml dependencies
- Remove unused packages (gradio, streamlit, trafilatura) from pyproject.toml

pyproject.toml

@@ -7,8 +7,9 @@ dependencies = [
     "aiohttp>=3.12.15",
     "asyncio-throttle>=1.0.2",
     "diskcache>=5.6.3",
-    "google-genai>=1.29.0",
-    "gradio>=5.42.0",
+    "fastapi>=0.100.0",
+    "google-generativeai>=0.3.0",
+    "jinja2>=3.0.0",
     "langchain>=0.3.27",
     "langchain-community>=0.3.27",
     "langchain-google-genai>=2.1.9",
@@ -18,7 +19,7 @@ dependencies = [
     "pydantic>=2.11.7",
     "python-dateutil>=2.9.0.post0",
     "python-dotenv>=1.1.1",
-    "streamlit>=1.48.0",
+    "requests>=2.31.0",
     "tenacity>=9.1.2",
-    "trafilatura>=2.0.0",
+    "uvicorn>=0.24.0",
 ]

requirements.txt

@@ -14,3 +14,4 @@ plotly
 pandas
 numpy
 jinja2
+requests

src/agent/memory_manager.py

@@ -1,4 +1,4 @@
-from langchain.memory import ConversationBufferWindowMemory
+from langchain_community.memory import ConversationBufferWindowMemory
 from typing import Dict, Any, List, Optional
 
 class MemoryManager:

src/agent/research_agent.py

@@ -1,6 +1,6 @@
 from langchain_google_genai import ChatGoogleGenerativeAI
 from langchain_community.llms import Ollama
-from langchain.memory import ConversationBufferWindowMemory
+from langchain_community.memory import ConversationBufferWindowMemory
 from typing import List, Dict, Any
 import asyncio
 from datetime import datetime

src/tools/base_tool.py

@@ -1,6 +1,6 @@
 from abc import ABC, abstractmethod
 from typing import Dict, Any, Optional, Union
-from langchain.tools import BaseTool
+from langchain_community.tools import BaseTool
 from pydantic import BaseModel, Field, PrivateAttr, field_validator
 import asyncio
 import aiohttp

src/tools/chart_creator_tool.py

@@ -1,4 +1,4 @@
-from langchain.tools import BaseTool
+from langchain_community.tools import BaseTool
 from pydantic import BaseModel, Field
 from typing import Dict, Any, List, Optional
 import json

src/tools/chart_data_tool.py

@@ -1,4 +1,4 @@
-from langchain.tools import BaseTool
+from langchain_community.tools import BaseTool
 from pydantic import BaseModel, Field
 from typing import Dict, Any, List, Optional
 import json