Open WebUI crashes on startup because it can't write its SQLite database to
/app/backend/data.
- Add emptyDir volume at /app/backend/data
- Pod restarts will lose data (dev-only acceptable)
Fixes pod crash: peewee.OperationalError: unable to open database file
- Enable Hermes API Server (port 8642) in gateway deployment
- Add Open WebUI deployment connected to Hermes API Server
- Expose Open WebUI via Tailscale using Service annotations
- Create ClusterIP Service for Hermes Agent API Server
- All deployments follow PodSecurity restricted policy