feat: add a dedicated remote-worker queue for AI workloads

[ibourgeois]

Context

As a Katra operator, I need AI-heavy jobs to flow through a dedicated remote-worker queue so desktop workers can contribute local model capacity without taking over the default Laravel queue used for normal server-side work.

Acceptance Criteria

• Katra defines a dedicated queue path for remote-worker AI workloads.
• The default queue remains reserved for normal server-side Laravel app execution.
• Desktop workers can pull jobs only from the dedicated remote-worker queue.
• Queue routing rules are documented so AI workloads can be directed to remote workers when server resources are insufficient or unavailable.

Notes

The intent is not to make every job eligible for desktop execution. This queue is specifically for workloads that can safely run on authenticated remote workers, especially AI/model workloads.

Out of Scope

• The worker registration handshake itself.
• Security hardening, data isolation, or cleanup behavior inside worker-executed jobs.