- Add configuration endpoints (GET/PUT /config) for plugin settings
- Add custom settings UI with Alpine.js + Tailwind CSS
- Settings include: STT service URL, timeout, SSL toggle
- Advanced settings: debug mode, log level, auto-cleanup
- Test Connection button for STT service health check
- postMessage communication for parent window notification
- Update CLAUDE.md and README.md with new endpoints

🤖 Generated with [Claude Code](https://claude.com/claude-code

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>