Add AgentDispatchQueue service (outbound dispatch queueing)

[erikhortsch]

Summary

• Adds a new public twirp service AgentDispatchQueue (livekit_agent_dispatch_queue.proto) with AddJobs, RemoveJob, GetJob, ListJobs, RetryJobs, GetDispatchQueueConfig, UpdateDispatchQueueConfig.
• Adds QueuedJob / QueuedJob.Input / DispatchQueueConfig messages. Per-job webhooks reuse the existing WebhookConfig (same pattern as Egress per-request webhooks).
• Adds AgentGrant.DispatchAdmin for authorizing the new RPCs.

Follows the AgentSimulation precedent: a dedicated service intended to be served directly by cloud-api-server (see stacked PRs in cloud-protocol / agents-private / cloud-api-server), rather than routed through the room-keyed AgentDispatchService used for just-in-time dispatch.

Part of the Agent Dispatch Queueing project. Design doc: Agent Dispatch Queueing Service — Design Doc (Notion).

Stack

1. protocol (this PR) — public contract + grant
2. cloud-protocol — internal psrpc service (AgentDispatchQueueInternal)
3. agents-private/agent-service — queue implementation, new job type
4. cloud-api-server — authenticated twirp shim (mirrors SimulationService)

Test plan

• go build ./...
• go test ./auth/... ./livekit/...
• Downstream repos build against this branch (go get github.com/livekit/protocol@erikhortsch/agent-dispatch-queue-api)

🤖 Generated with Claude Code

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