Update app.py

adds typing imports

app.py

@@ -1,9 +1,11 @@
 from fastapi import FastAPI, HTTPException
 from pydantic import BaseModel
 from transformers import T5Tokenizer, T5ForConditionalGeneration, GenerationConfig
+from typing import Optional, Dict, Any
 import logging
 import os
 import sys
+import traceback
 
 # Initialize FastAPI first
 app = FastAPI()