- Switch speakText() to call /api/text-to-speech backend (ElevenLabs) with fallback to native speechSynthesis
- Upgrade ElevenLabs voice from Rachel to Adam (pNInz6obpgDQGcFmaJgB) — warmer, more professional
- Upgrade model from eleven_monolingual_v1 to eleven_turbo_v2_5 for better quality and lower latency
- Enable Helmet CSP (scripts/styles/fonts/connect restricted to self + CDNs)
- Lock CORS to APP_URL origin in production (open in dev)
- Reduce JSON body limit from 50mb to 1mb
- Add per-route rate limits: login 10/15min, register 5/hr, forgot-pw 5/hr
- Add README with full setup, Docker Hub, provider switching, env reference
- Bump version to 3.0.0