Add CompanyTable model and refactor query handling; update requirements for new dependencies

app/services/openrouter.py

@@ -3,13 +3,12 @@ from typing import List, Optional
 
 import chromadb
 import pandas as pd
+from db.models import InvestorTable
 from langchain_core.prompts import PromptTemplate
 from langchain_openai import ChatOpenAI
 from pydantic_schemas import Investor, InvestorList
 from settings import settings
 
-from app.db.tables import InvestorTable
-
 # Add these imports for your databases
 # from sqlalchemy.ext.asyncio import AsyncSession
 # from your_vector_db import VectorDBClient