feat(agents): add streamlined lk agent init command

[rektdeckard]

https://linear.app/livekit/issue/DPRO-491/cli-focused-onboarding-spike-and-all-hands-demo

• Adds lk agent init command, which automatically gives the cloned template an agent name, creates a sandbox, sets up explicit dispatch for it, and prints its URL on completion
• If authenticating your first project via CLI, automatically make it the default project

DEPENDS ON: https://github.com/livekit/cloud-api-server/pull/1311 and, indirectly, livekit-examples/agent-starter-python#25

If you want to test it now, you'll have to test against staging API and a dummy agent template:

lk agent init \
  --server-url https://cloud-api-server-public.ochicago1a.staging.livekit.app \
  --dashboard-url https://cloud.staging.livekit.io \
  --template-url https://github.com/livekit-examples/agent-starter-python-gateway

Screen.Recording.2025-10-01.at.1.02.48.AM.mov

[yoonsio]

LGTM

[real-danm]

maybe a future todo, this is a long sleep though. maybe a loop to check for the keys?

[rektdeckard]

Yeah..2 seconds worked 95% of the time, I just wanted to be safe. More investigation necessary in cloud-api-server side, I don't have a strong intuition for AKP and why it would not reflect very recently created keys.