from fastapi import FastAPI, HTTPException
from fastapi.responses import StreamingResponse
from pydantic import BaseModel, Field, validator
from typing import List, Dict, Optional, Any, Literal
from openai import OpenAI
import os
import json

DEEPSEEK_API_KEY = os.getenv("DEEPSEEK_API_KEY")
DEEPSEEK_BASE_URL = os.getenv("DEEPSEEK_BASE_URL", "https://api.deepseek.com")
UNIFIED_MODEL = "deepseek-lat...