Refactor SSHKeyManager to match app layout pattern:
- List of SSH keys on the left (SelectionRailCard)
- Key details and form on the right (SectionCard)
- Add selectedSSHKeyId state to Settings component
- Click a key to select and populate the form
- New key button to create a new key
- Shows fingerprint and public key for selected key
- Delete button moved to the right panel
Backend:
- FastAPI app with 17 REST endpoints covering dashboard, monitoring,
media index, file browser, and jobs
- Reuses existing clients/domain/services unchanged
- pydantic-settings config, dependency injection, CORS setup
- Auto-generated OpenAPI docs at /docs
Frontend:
- Vite + React + TypeScript SPA
- @tanstack/react-query for data fetching with polling
- ag-grid-react for media table and file browser
- recharts for monitoring charts
- Tailwind CSS styling
- 4 pages: Dashboard, Monitoring, Media, File Browser
- Typed API client matching all backend endpoints
Also:
- docs/MIGRATION_PLAN.md with full architecture plan
- Updated .gitignore for both subprojects
- Streamlit app preserved for now (can coexist)