Google sign-in (demo)
Real Google sign-in: create a Web OAuth client ID and set GOOGLE_CLIENT_ID plus GOOGLE_CLIENT_SECRET. Redirect URI: http://127.0.0.1:43123/api/auth/google/callback
Real Google sign-in: create a Web OAuth client ID and set GOOGLE_CLIENT_ID plus GOOGLE_CLIENT_SECRET. Redirect URI: http://127.0.0.1:43123/api/auth/google/callback