fix: Add Request parameter to Google OAuth endpoints

Pass the FastAPI Request object to authorize_redirect() and authorize_access_token() methods as required by Authlib's Starlette integration

backend/main.py

@@ -1,4 +1,4 @@
-from fastapi import FastAPI, HTTPException, Header, Depends
+from fastapi import FastAPI, HTTPException, Header, Depends, Request
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.responses import RedirectResponse
 from pydantic import BaseModel, Field, ConfigDict
@@ -227,17 +227,17 @@ def logout(authorization: Optional[str] = Header(None), db: Session = Depends(ge
     return {"message": "Logged out successfully"}
 
 @app.get("/auth/google")
-async def google_login():
+async def google_login(request: Request):
     """Initiate Google OAuth login"""
     redirect_uri = os.getenv('GOOGLE_REDIRECT_URI', 'http://localhost:8000/auth/google/callback')
-    return await oauth.google.authorize_redirect(redirect_uri)
+    return await oauth.google.authorize_redirect(request, redirect_uri)
 
 @app.get("/auth/google/callback")
-async def google_callback(code: str, db: Session = Depends(get_db)):
+async def google_callback(request: Request, db: Session = Depends(get_db)):
     """Handle Google OAuth callback"""
     try:
         # Get access token from Google
-        token = await oauth.google.authorize_access_token()
+        token = await oauth.google.authorize_access_token(request)
         
         # Get user info from Google
         user_info = token.get('userinfo')