Feature: Globe Scroll, Direct Routing, and Email 2FA

[google-labs-jules]

Implemented changes:

1. Globe Interaction: Updated GlobeBackground.tsx to handle vertical swipes natively (allow page scroll) while keeping horizontal swipes for globe rotation.
2. Routing: Removed SPA-style redirect logic in frontend/pages/index.tsx for /post/... and /chat-room/... routes, enabling direct navigation to these pages.
3. Email 2FA:
   • Added email_2fa_enabled preference to User model.
   • Updated backend login logic to check this preference and require a verification code sent via email.
   • Added backend endpoint /verify-login-email-2fa.
   • Added toggle in Settings page.
   • Updated Login page to handle the 2FA verification step.

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PR created automatically by Jules for task 15243479983392054904 started by @8JP8

[google-labs-jules]

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