- Implement SessionStore interface for pluggable storage backends
- Add redisStore for distributed environment
- Add memoryStore as fallback for single instance
- Update router to initialize Redis client when configured
- Update .env.example with Redis documentation
- Create internal/passkey/ package with challenge session management
- Add HTTP handler layer in internal/api/passkey.go
- Simplify Passkey model to use blob credential storage
- Register passkey routes in router
- Update frontend to match new API endpoints
- Add .env.example template
Sakurasan