Fix typing imports

routers/powerpoint.py

@@ -1,7 +1,7 @@
 from fastapi import APIRouter, Depends, HTTPException, File, UploadFile, Form
 from fastapi.responses import FileResponse
 from pydantic import BaseModel
-from typing import Annotated, List, Literal, Optional, Union
+from typing import Annotated, List, Literal, Optional, Union, Dict
 from google import genai
 from google.genai import types
 from auth import verify_token