feat(v5): add server bootstrap job with realtime cluster broadcasting
- Add V5BootstrapServerJob: SSH into new servers, install coold/WireGuard,
track bootstrap progress via last_bootstrap_action/status/output fields
- Add V5ClusterUpdated event: broadcasts full cluster+servers payload to
team private channel on bootstrap state changes
- Add V5RealtimeTestEvent + RealtimeTest page for WebSocket connectivity testing
- Consolidate 3 dropped migrations into base cluster/server migrations:
WireGuard config, builder CPU quota, status check fields, uuid
- Auto-generate uuid on V5Model create via Schema::hasColumn guard
- Expose currentTeam.id in Inertia shared props
- Add showCluster, realtimeTest, broadcastRealtimeTest controller endpoints
- Add dropdown-menu UI component
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