- Replace endpoint cooldown tracking with centralized EndpointHealth system for MTProxy attempts
- Add multi-profile ClientHello builder with Chrome Modern (validated), Android Chrome, and other profiles
- Implement SeekFramePolicy for video seeking (AtOrAfter/AtOrBefore/Nearest)
- Enhance proxy status with terminal reasons, attempt tracking, and severity levels
- Add ConnectionNotice for WSS unavailability recommendations
- Change default proxy port to fixed 1353
- Implement delayed ClientHello sending with connection pattern spacing
- Update terminology from 'JA4 fingerprint' to 'ClientHello profile'
- Add comprehensive test coverage for new systems
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