Remove unused imports and simplify FastAPI/Gradio dependencies

main.py

@@ -1,9 +1,8 @@
 import logging
 import os
 from contextlib import asynccontextmanager
-from fastapi import FastAPI, Request, Response, HTTPException
-from fastapi.middleware.cors import CORSMiddleware
-import gradio as gr
+from fastapi import FastAPI, Request
+from gradio import gr
 from gradio.routes import mount_gradio_app
 
 from api.routes import router