feat: M6 maintenance windows + M7 WebSocket relay (real-time job status)
M6 - Maintenance Windows:
- routes/maintenance_windows.rs: full CRUD API
- migrations/004_maintenance_windows.sql
- frontend/MaintenanceWindowsPage.tsx
- HostDetailPage.tsx: maintenance window config panel
M7 - WebSocket Relay:
- pm-web: POST /api/v1/ws/ticket (JWT-auth, single-use, 60s TTL)
- pm-web: WS /api/v1/ws/jobs?ticket=... (PgListener -> browser push)
- pm-web: DashMap<String,WsTicket> in AppState, 30s cleanup task
- pm-worker: ws_relay.rs subscribes to agent WS, updates patch_job_hosts,
fires pg_notify(job_update) for real-time fan-out
- frontend: useJobWebSocket hook with auto-reconnect + exponential backoff
- frontend: JobsPage live updates with WS status indicator
- types: JobWsEvent interface
- api/client: wsApi.createTicket()
All tasks marked complete in tasks/todo.md
cargo build: zero errors, zero warnings
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