Remove public API - require Google Cloud authentication

Add retry logic and better rate limit handling

Fix Google API authentication - use public endpoint first

Fix 403 error and URL parsing issues

Remove demo mode - require proper Google OAuth2 authentication

Implement OAuth2 authentication for Google PageSpeed Insights API

Replace PageSpeed API with demo mode due to OAuth2 requirements

Fix environment variable handling and improve error messaging

Refactor PageSpeed Insights analyzer into modular architecture

Update extract_pagespeed_data to use PageSpeed Insights API instead of scraping

Implementação do comparador de PageSpeed Insights com OpenAI

initial commit