v5.0.5: Improved MITM detection for CloudFlare CDN

• More robust TLS certificate verification that handles CloudFlare edge certificate rotation
• Per-hostname fingerprint caching (trashmail.com and mail.aionda.com use different certificates)
• Fixed false MITM alarm caused by 308 redirect from trashmail.com to mail.aionda.com
• Hardened certificate fingerprint API whitelist

Fix: Guardian MITM protection now works correctly on mail.aionda.com after the domain migration from trashmail.com. This resolves the "Response signature missing" warning and SHA256 certificate fingerprint mismatch (Issue #6).

Version 5.0.3:
- Domain migration: API endpoints updated to mail.aionda.com
- Updated support contact
- OPAQUE authentication improvements
- Guardian MITM protection: continued monitoring of trashmail.com and mail.aionda.com domains
- Bug fixes and stability improvements

Version 5.0.0 - Major Security Update

New: Guardian MITM Protection
- Ed25519 cryptographic signatures verify every server response
- TLS certificate fingerprint verification (Firefox only)
- Real-time warnings if your connection is intercepted by corporate proxies (ZScaler, Netskope, etc.) or attackers
- Visual security status indicator in the extension badge

Improved Localization
- Full support for English, German, French, and Esperanto
- All security warnings are now properly translated

Technical Improvements
- Updated to Manifest V3 (MV3) standard
- Added scripting API for better compatibility
- Performance optimizations