feat : add import staticfiles

app.py

@@ -1,6 +1,7 @@
 from fastapi import FastAPI, Request, Response, Form, Header, HTTPException, BackgroundTasks
 from fastapi.responses import JSONResponse
 from fastapi.middleware.cors import CORSMiddleware  # 匯入 FastAPI 的 CORS 中介軟體
+from fastapi.staticfiles import StaticFiles
 
 from typing import Annotated # 推薦用於 Pydantic v2+
 import pandas as pd