Handle Google Sign-In via separate window instead of proxying

[Copilot]

Google's authentication policies break when proxied through the worker. This adds interception for Google Auth URLs to de-proxy them and open in a separate popup window, allowing direct authentication with Google.

Injection Script Changes

• Added isGoogleAuthUrl() to detect Google auth patterns (accounts.google.com, googleapis.com/identitytoolkit, OAuth endpoints)
• Added deProxyUrl() to extract original URLs from /proxy/{encoded} format
• Extended window.open interceptor for Google Auth detection
• Added click/submit event listeners (capture phase) for Google Auth links and forms
• Wrapped DOM event listeners in DOMContentLoaded check

Main UI Changes

• Added GOOGLE_AUTH message handler that opens a 500x600 popup directly to Google

Example Flow

// Intercepted proxied URL
'/proxy/https%3A%2F%2Faccounts.google.com%2Fo%2Foauth2%2F...'

// De-proxied and opened in separate window
'https://accounts.google.com/o/oauth2/...'

Also updated README to reflect new Google Sign-In behavior.

Original prompt

give me a updated worker script that uses the same ui and game interseption, but handles google-sign in diffrentley by not proxying it so it looks like its comming from cloudmoon (use a similar interseption system to look for the proxyied google auth url, de proxy it, and then load it in a seprate window.

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