Add replicated:true support to restart operation

## Request

The `restart` operation (full node restart) does not support `replicated: true`, making it necessary to send a separate `restart` request to each node in a cluster individually.

The `restart_service` operation has `replicated` support (via `replication.sendOperationToNode`), but `restart` does not — see `core/bin/restart.ts`.

## Proposed

Add `replicated` field handling to the `restart` operation, analogous to how `restart_service` handles it: iterate connected nodes and dispatch the operation to each before/during local restart.

```json
{
"operation": "restart",
"replicated": true
}
```

**Note:** Full process restart is more disruptive than `restart_service` — consider whether to restart nodes sequentially (rolling) vs. in parallel.

🤖 Filed by Claude on behalf of Kris.